I made these coasters as a Christmas gift last year. They are inexpensive and reasonably quick to make on a laser cutter. I made it at the TechShop
in San Francisco.
You will need:
* Access to a laser cutter
* Note cards and envelopes. I used 3x5 cards. You can find them at an art store like Blick, Utrecht or Flax. Lighter colors will generally give you a subtler contrast to the monogram and darker colors will produce a stronger contrast.
* ~20 small weights (I used sections of T-50 staples)
* Painters tape
* Blank newsprint or butcher paper