In this instructable, simple, useful coasters are made out of free materials, generally. I have lots of papers on hand and the cardboard is gathered from used boxes, available just about everywhere. Good way to recylce the cardboard. Gather some cardboard pieces, here are the end flaps from regular cardboard boxes.
Step 1: Make Blanks Out of Cardboard
Cardboard pieces glued together in stacks of three each.