Okay, in the hypothetical world where 1 satoshi is worth some huge amount of USD more than it presently is, if you suck up the electricity cost now (which I believe would be less than $1 USD per day for an i7) you can get a few satoshi that may one day make that up-front cost worth it...
Whether you can actually get a single satoshi from a pool is another story. If the pool uses PPLNS, you might not ever. I think most would object to you for being misleading. If you want bitcoins, buy them, or get an ASIC miner and don't use a sucky-ass CPU or GPU.
By the calculations above, you would be far, far better off just buying Bitcoins on an exchange than you would be mining them with non-free electricity.
Seriously, you can. Just based on your comment alone:
> an i7 with free electricity mining all the time at 8 MH/s would make about 9 US cents in a month
This means at the current rate you will make
Oh, and the calculator you linked to is crap, it only gives 3 significant digits of BTC, which is quickly becoming relevant.