Teresa,

Other than paint, two thoughts come to mind, one cheap and temporary and one expensive....

Next time you go shopping in your local supermarket or Walmart look down -- A lot of retailers are using special vinyl floor-graphics.  I've not had any experience, so I don't know about durability and such, but if it's good enough to hold up for X? months at Walmart it'd survive my few-thousand feet a year.   A Google search with the words "vinyl floor graphics" turned up and interesting article with some of the basic info -- http://www.signweb.com/index.php/channel/1/id/40/

The Mississippi River Museum in Dubuque, IA has a very large terrazzo inlay showing a map of the mighty Mississippi River on their entrance hall floor.  Again, I don't know how permanent your installation is going to be, but this Mississippi terrazzo looked FANTASTIC!

Along that same line, we've got a concrete floor that stamped and stained to look like wood planks.  It's a very thin (quarter inch) concrete overlay that's poured on top of our existing concrete floor.   Conceivably you could do the same thing, except "stamp" (score?) your timeline into the concrete.  I don't know if it's ever been done before, but perhaps you could even stamp lettering into the topping? 

- David -
David Lewis, curator
Aurora Regional Fire Museum
www.AuroraRegionalFireMuseum.org
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