My friend Nicole has this adorable stamp wallet that I love that is designed to look like a letter. I can’t find it online but it is well made and seems to be leather – I think it was purchased in London. It inspired me and helped me come across these great recycled wallets by (Dynomighty . They print designs onto Tyvek to create earth-friendly wallets with fun themes like Air Mail letters, vintage postcards, Subway maps, tattoos, etc. I noticed that a lot are on sale on eBay (and then you will earn eBay bucks). Also, if you Google “how to make a Tyvel wallet” you will find lots of tutorials on Instructables, YouTube, and How Stuff Works. I don’t have any Tyvek to try it. I do wonder if stuff falls out of the wallet because it looks like stuff could fall out of the sides?