Junk Mail Journal
In this video, Papyrus Rex shows you how to create an upcycled journal using junk mail and water. The cover is also recycled, made from "yesterdays circular magazines, brown shopping bags, and an old polyurethane jacket." Creating handmade paper can require a lot of specialized tools, but if you've got the setup I love the idea of using discarded materials!
If you don't have the tools to make paper, you can also check out Matt's tutorial for making a day planner out of trash!