I have gotten a number of LOTR-themed patches, flags, and blankets from Loot Crate in the past. I would like the 3 patches sewn onto the backpack, as well as cut-up pieces of the flag fabric sewn to it (you can get creative with that part!). I can supply all the LOTR stuff and the backpack!
depending on how big or small I can make this project, I had another idea. There is a huge LOTR map I got from them and it would be cool to have every surface of the backpack have the map on it, almost like the map is a globe with middle earth on it :) don't know if this is possible but would be cool.