Bamboo Puzzle Piece Coasters
As is the case with similar cork coasters, if you have a lot of condensation forming you might get some runoff. But these coasters are really neat, especially for someone in your life who's really into puzzles. Plus the cool factor of actually being a puzzle in and of themselves is a nice bonus.
They form into a trivet - which is a fancy word for a serving platform. (It's the first time we've EVER heard that word, so don't feel bad if it's new to you too!)
The next time we buy some coasters, these are #1 on our list - just super cool!