How can I recycle rubber mousepads?

I work at an office where sales representatives leave numerous promotional products that accumulate. Rubberized mouse pads should have good alternative uses but I can't think of many. I guess I could put them between pots and pans to keep them from clanging in the kitchen or use them as coasters but they aren't attractive and I don't want to have them on display. Yes I could donate them to a school but they have pharmaceutical ads on them and I don't want to push this commercialism on kids. Any ideas?