I love love love stampin' on tiles! It is always a WOWzer. I stamp on either the 2x2 for magnets or the larger ones for coasters at least 2 times a year with my workshops. For workshops, I only do one coaster of course. But I think they are cheap, easy and fun.
I haven't done a craft fair yet but I am hoping to be able to next fall. I really wanted to this year but the year just got away from me.