bitcoin mining

hello, so me and a friend are in need of extra money so we thought we could do something related with bitcoins.. his parents own a semi big commercial store and we have permanent and free access to the headquarters where we go to play with our noise toys. anyway, there is like 50 or more computers that sit awake everynight when the people who works there goes home. is there something we can do to put that machines to mine day and night? would it be useful? i know the bitcoin bubble is going to pop soon

Using 50 computers with AMD graphics running full time, it would take around one year to mine a block of 25 bitcoins at the current reward rates. Think about it, one year of 50 computers draining the maximum amount of electricity. The person paying for the electricity would notice it if you started mining 24/7 with a single computer.