https://en.wikipedia.org/wiki/Cosmo_Kramer#Coffee_Table_Book_about_Coffee_Tables (follow the link where you'll find the text formatted better for an easier read)
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Kramer's other inventions and ideas
A pizzeria where you make your own pizza pie. ("Male-Unbonding") It falters because of a dispute between Kramer and Poppie over whether cucumbers can be pizza toppings ("The Couch").
Installing a garbage disposal as the drain in his shower, so that he can prepare vegetables while showering ("The Apology").
Redoing his entire apartment in imitation wood wallpaper - "It's wood, Jerry." ("The Junior Mint").
Redecorating his apartment with the set of The Merv Griffin Show ("The Merv Griffin Show").
Adding a screen door outside his apartment front door ("The Serenity Now").
Using the homeless to pull rickshaws in New York City ("The Bookstore").
Reversing the peephole in his apartment front door so he can see inside to see if someone is waiting to ambush him with a sock full of pennies, something that happens to another character at the end of the episode ("The Reverse Peephole").
Taking half of Jerry's food and inserting I.O.U.'s in a nearby jar ("The Seven").
Owning his own chicken to obtain fresh eggs. He later discovers that the chicken is really a rooster and trains him to become a cock fighter ("The Little Jerry").
Saving his blood in a refrigerator ("The Blood").
Joining Newman who re-attempts an original (and refined) idea by Kramer, using a mail truck to take cans to a Michigan recycling plant, where the bottle deposit return is worth 10¢, as opposed to New York's 5¢ ("The Bottle Deposit").
Getting rid of his refrigerator so that he will only eat fresh food ("The Soup").
Placing oil in a giant rubber bladder to prevent oil spills. However, during the test of the giant ball of oil at Play Now, it falls on the unsuspecting head of Jerry's girlfriend, after which he complacently remarks, "Well, that didn't work." He then has the idea to put Ketchup and Mustard in the same bottle. ("The Voice")
A small statue of Jerry made of fusilli pasta (because he's silly), a macaroni statue of Bette Midler (Macaroni Midler), and a ravioli statue of George (presumably "ravioli George"). All pastas "capture the essence" of their respective personae. ("The Fusilli Jerry", "The Understudy", seen in the background of his apartment in various preceding episodes).
A cologne that smells of the beach, an idea eventually stolen by Calvin Klein. ("The Pez Dispenser" and "The Pick")
Blacking out the divider stripes on two of the lanes in a four-lane highway to make it more "luxurious." ("The Pothole")
A brassiere for men. ("The Doorman", later mentioned in "The Fusilli Jerry") Kramer and Frank Costanza dream this up as a business partnership. It never happens because they strongly disagree over the name for this product: Kramer wants to call it the "Bro", Mr. Costanza wants to call it the "Manssiere".
A necktie dispenser to replace dirty ones("The Stock Tip")
Vowing to only wear clothes which were fresh out of the dryer. He ends up baking the clothes in the oven, having run out of quarters for the machine. ("The Calzone")
Adding wooden levels to his apartment to create space and eliminate furniture. Seen in both ("The Pony Remark") and in the pilot which Jerry and George create for NBC.
A restaurant that serves only peanut-butter and jelly, called PB and J's. ("The Friars Club")
A book called "Astonishing Tales of the Sea." ("The Andrea Doria")
A pizzeria where you make your own pizza pie. ("Male-Unbonding") It falters because of a dispute between Kramer and Poppie over whether cucumbers can be pizza toppings ("The Couch").
Installing a garbage disposal as the drain in his shower, so that he can prepare vegetables while showering ("The Apology").
Redoing his entire apartment in imitation wood wallpaper - "It's wood, Jerry." ("The Junior Mint").
Redecorating his apartment with the set of The Merv Griffin Show ("The Merv Griffin Show").
Adding a screen door outside his apartment front door ("The Serenity Now").
Using the homeless to pull rickshaws in New York City ("The Bookstore").
Reversing the peephole in his apartment front door so he can see inside to see if someone is waiting to ambush him with a sock full of pennies, something that happens to another character at the end of the episode ("The Reverse Peephole").
Taking half of Jerry's food and inserting I.O.U.'s in a nearby jar ("The Seven").
Owning his own chicken to obtain fresh eggs. He later discovers that the chicken is really a rooster and trains him to become a cock fighter ("The Little Jerry").
Saving his blood in a refrigerator ("The Blood").
Joining Newman who re-attempts an original (and refined) idea by Kramer, using a mail truck to take cans to a Michigan recycling plant, where the bottle deposit return is worth 10¢, as opposed to New York's 5¢ ("The Bottle Deposit").
Getting rid of his refrigerator so that he will only eat fresh food ("The Soup").
Placing oil in a giant rubber bladder to prevent oil spills. However, during the test of the giant ball of oil at Play Now, it falls on the unsuspecting head of Jerry's girlfriend, after which he complacently remarks, "Well, that didn't work." He then has the idea to put Ketchup and Mustard in the same bottle. ("The Voice")
A small statue of Jerry made of fusilli pasta (because he's silly), a macaroni statue of Bette Midler (Macaroni Midler), and a ravioli statue of George (presumably "ravioli George"). All pastas "capture the essence" of their respective personae. ("The Fusilli Jerry", "The Understudy", seen in the background of his apartment in various preceding episodes).
A cologne that smells of the beach, an idea eventually stolen by Calvin Klein. ("The Pez Dispenser" and "The Pick")
Blacking out the divider stripes on two of the lanes in a four-lane highway to make it more "luxurious." ("The Pothole")
A brassiere for men. ("The Doorman", later mentioned in "The Fusilli Jerry") Kramer and Frank Costanza dream this up as a business partnership. It never happens because they strongly disagree over the name for this product: Kramer wants to call it the "Bro", Mr. Costanza wants to call it the "Manssiere".
A necktie dispenser to replace dirty ones("The Stock Tip")
Vowing to only wear clothes which were fresh out of the dryer. He ends up baking the clothes in the oven, having run out of quarters for the machine. ("The Calzone")
Adding wooden levels to his apartment to create space and eliminate furniture. Seen in both ("The Pony Remark") and in the pilot which Jerry and George create for NBC.
A restaurant that serves only peanut-butter and jelly, called PB and J's. ("The Friars Club")
A book called "Astonishing Tales of the Sea." ("The Andrea Doria")
But if it were a real place, Kramer would have the bright idea of only accepting Bitcoin as payment on the premises.