The first experiment growing bacteria on the agar will be fingerprints as supposedly there is vast amount of microflora on the fingers and it will yield interesting results. For this, I've decided to touch everything on my way to Cavendish today with my left hand and nothing with my right hand and then fingerprint both of my hands to see what happens... this should be interesting.
This is my left hand that I touched everything with (train seats, poles, door handles, my shoe, the table, etc) and then what it looked like after I washed it with lab strength soap!