How do protect floor from drums?

a good one i came across a while back, totally on accident, is just a piece of carpet padding...the rubber is nice and soft and protects the floor wall, but doesn't slide like a rug or piece of carpet sometimes does
 
I use a $10 one from Wal-Mart that is like 5'x7', been working great so far.
 
If you've got some coin and a decent hand with a hammer, you could build a small platform for them to sit on. Actually, I think Oz wrote about that.