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While this shows how to make a travelling Tic Tac Toe game from smooth rocks and a pre-made burlap bag, one could also crochet a bag with the board pattern as part of the design, rather than painting it on with paint-pens.

Rather than melting the wax and pouring, one heats up the rocks and draws. Cool idea. Also some good tips as to how to avoid burning oneself while doing this.

This is like the stone + felt trivet tutorial, but instead of using two pieces of felt, it uses a pre-existing cork trivet and glues the stones onto that. One could use flat glass pebbles instead of stones.

(Mind you, it seems a bit pointless to replace a perfectly useful cork trivet with an uneven stone trivet, but I'm bookmarking this anyway)

This tutorial just uses stones and felt.

I've also seen a suggestion that one could stiffen up the trivet by sandwiching a CD in between the two pieces of felt. Though that would make something closer to the size of a coaster than a trivet.

One could also use those flat glass pebbles instead of stones.