I don't think starting your own pool would be a good way to do this.
Have you made any calculations? It depends a little on which i7 you have, but since I don't expect your employer to buy computers with high end CPU's (actually the fact you have i7's is already quite rare, you see i5's or even i3's way more often), lets say you can get ~35kh/s per CPU. That would set your total hashrate at ~3255kh/s, which is quite a nice hashrate, comparable to around 3x 7990 GPU. But, most pools are in the order of several hundred mh/s, and you only get 3.3mh/s.
Since the chance of finding a block is highly correlated with the total hashrate of a pool, I think it would be much better to join an existing pool.
Having that said, the suggestion of Jothand is actually a great way to do this. Set up your own pc as a stratum proxy, and have all the other pc's point at your proxy. If you want to switch pool/coin, you will only have to change the setting on your own computer, and all others will automatically work for that pool.
Apart from mining CPU coins like quark, you could definitely also look at some scrypt coins. Since you don't have to pay power, you could even mine LTC, which would still give you around 1LTC per day at the current difficulty. It may also be worth keeping an eye on this subforum, and mine some of the newly launched coins. At the start of a coin you can easily get huge amounts in a short time frame, which could become a lot more valuable in the future (but this is a gamble of course).
Hmmm... Tks too much!
The i7s (actually only 80 are i7) have 8 cores each (made on 2012). The other 13 computers are mixed (2 quad core, 2 core 2 duo, etc...)....
Yes.. we´re a little afraid because of the electricity bill. But we still want to "see for believe" and maybe make some adjusts to make it be profitable.
No, we dont planing to buy more computers. I convinced my father (owner here), that we could use these computer out working time.
I as far as I could see, LTC have already reached a dificulty level that my computers cant compete with.
Maybe after all working, I can measure my scrypt rate power and point to another coin.... I still didn´t got to connect to my server (P2Pool). ahahahahah!! it says "connected to 192.168.1.254" but 0.0Kh/s.
But the most important information now, is that I have to confifgure my stratum server and configure all computers to connect to it. So I configure this stratum server to use some pool.
OMG! I almost understanding 100% ... what a weight out of my back!..lol
Tonight I will dive in this issue again and maybe sleep here until make it work!!
Thanks again!!
you dont need to have 3 gpus per one machine... one would be good enough 
just tell them to open the windows in the morning.