With my "new" '85 Westy I wanted to try something different on the floor
than carpet, given the wet and muddy camping I often find myself doing.  I
decided to try Elephant Bark, and I love it!
http://www.rubbercal.com/elephant_bark.html

It's 1/2" thick, tough as nails, and cleans up easily (easy to remove and
hose off too).  It feels good on bare feet and things don't slide around on
it.  I got the red dot version, but now I wish I'd gotten candy corn.  Only
caveat is that it smelled strongly from the recycled tires it's made from,
but after a month of airing out it's now odorless.

Stuart

'85 Westy