I did something like that in a non-SU class. We used a good quality brown cardstock, wet it with a stamp refresher (I suspect water), then crumpled it up, ironed it, then ran a brown ink pad over what bumps were left. It turned out really nice. Then I just found this on SCS with a search that was for faux suede:
Forums at Splitcoaststampers
Forums at Splitcoaststampers
That ought to be enough to get you in trouble ! the links appear the same, but I checked and they are different.