Can you think of something creative and cheap/free to use as a floor covering?

I'm about to do a little work on a house and I'm trying to think of some creative floor coverings to use instead of the normal stuff. Carpet tiles are cool and around a buck a tile for little over 1sq ft. But I want cheaper and more creative. One of my ideas is to take wood scraps from the construction on the house, fit the chunks together on the floor, and liquid nails them to the floor, forming a mosaic style wood floor. Cheap and should look good.

Here are some good mosaic patterns:

http://www.findanyfloor.com/article/TheHistoryofMosaics.xhtml

you can even use glass... a smash a Heineken bottle for the green? an agua bottle for the bright blue, etc etc. its interesting, install properly to not cut yourself but its been done a million times and it looks amazing!

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