Those seem to be exactly what the OP wanted. They look better than I thought they would (for some reason I was thinking of black pads like the ones on my laptop). I'm still not a fan of how rubber feet look on the corners of the iPad though.
These actually look pretty nice! I love using my iPad without the iPad case it came with, but I could never prop it on my knees when I'm lounging because it always slides down. I wonder if these $5 small rubber feet would do the trick.
EDIT: whoops, meant to quote the one who posted the idroplets website. My bad!