What do you have for a floor covering?

[ezdays]

I have vinyl flooring that looks like wood, (I didn't want to spend the money for wood flooring and didn't think carpeting would be good to do modeling on) and I'm also using some of those Harbor Freight mats around the train tables just to make it more comfortable to walk on. The only problem with that is that little bits and pieces get trapped around the mat and the floor.