This year for Christmas I'm cutting and folding wallets made out of Tyvek paper, and then coloring them with alchohol inks. I don't think I'm going to have time to tangle them, but this one I did using a micron pen, and shading with Pitt brush pens.
I'm not sure how long these will last, but the Tyvek paper costs about $2.00 for a 23 x 35 sheet, which is enough for two wallets. The alchohol inks are a lot more expensive, but still--I can make the wallets for about $4-$5 dollars apiece. If they don't last, I'll just make more next year, lol!
Here's the wallet, which happens to use my pattern "Chilgoza" (along with "Facets", the latest tangle posted in the zentangle newsletter, and several other of my own patterns.