To stay consistent, I see 2 definitions in the name bubble :
- "bubble" like in chats and messaging. I have no idea what specs you have in mind and I have nothing to suggest here.
- "bubble" like a hype and exponential growth.
I may suggest 5 old or earlier models which can create scarcity and huge, sometimes irrationnal, interest :
1/ A very old coin, named savecoin, automatically distributed each day at same hour interests depending on how much you had on your adress. It is better than POS and "staking" because there were no need to have a wallet, or leave it open. People were very keen to hold and new members wanted to enter at whatever the price.
This coin made X7500 on bittrex. If the dev hadn't quited, the coin would have stayed alive.
2/ The famous DRK with masternodes that remove liquidity from markets with a 1000 coins minimum. Went X2000.
3/ Byteball, with distribution round every month for the next year. People are buying at 220$ each whereas most coins were free.
4/ Antshares, a coin still under radar, has also a more classic model, allowing only antshares bought during an ICO to generate antcoins, which will be used for creating assets.
5/ Minereum did an innovative airdrop and distribution (via a ETH smart contract) allowing only 4000 specific adresses to mine for life. Only these adresses may mine 3 coins a day. So the liquidity stays low. Only a few coins on the mining adresses may be progressively moved or sold.
The only problem is you can't sold genesis adresses (because the seller will still have the priv. key and you can't move the right to mine to another adresses). Else, there will be a specific and very profitable market only for these adresses. Nevertheless people sometimes gave exchange adresses or tend to lose keys so the model may be not sustainable without new players entering and new mining adresses.
What I would suggest :
BUB bagholders holded for months or years (a shitcoin like even you said :-D)
This fidelity and anteriority now justifies and deserves a special right to mine. Like minereum, I would suggest that only adresses with coins last year on their wallet may mine. proportionnaly to their holdings. It must be an automatic mining, not staking, like savecoin or minereum. Easier for everybody.
To attract new big players, you can allow each month a stack of new adresses to mine, under precise conditions, like having more than 0,1% for the whole month. It is a definitive right to mine. Then you can't move or sell coins on theses adresses, only mined coins and a few % or the original amount. But you can add coins to mine more if you want (no need to create 2 adresses with 0.1%)
Just a few ideas, but this kind of mechanism, with your developpement in parallel, would make BUB to skyrocket.