I whipped up some terrain mat designs for use underneath regular tiles that I plan to print out and use so I though I'd share them. I've seen others using similar things and of course the mats that House Mouse has. I figure it would make it easy if you want to have the lowest level be a certain type of terrain (i.e.: a big desert, tundra, ocean, volcano, etc). I made them into PDFs at full size, 26 x 35.5 and as split files that print on 8.5 x 11 sheets that you can tape together. Please check all my downloads for the various mats.