Carpets? Pillows? Squares?

If you have spent any time in the elementary classroom you are well aware of the problem that arises when you consider how kids will sit on the floor. Do you have pillows for all of their precious bottoms? Or maybe you spent millions to buy a huge classroom carpet. Maybe you are like me and you have carpet squares. This has always been a hassle for me. I want something that is easy to clean and move around. I had this for a while. I was given industry grade sample squares that I pieced together to make one large rug. But, now my kids have picked it apart and ruined it. So, now comes the current problem, what do I do now? Do you have any ideas? What do you have your kids sit on?