This is not really off topic, but I thought I would post it here.
I have a stack of campaign posters almost 2" thick, and have found a great use for them.
Shims. They come in several different thicknesses of really nice hard cardboard, and I seem to use a lot of shims in various places. My favorite use is for spacing drawer guides, when they are just a bit too loose to the drawer. I also use them when lining up tools if they are just a bit off of level, etc.
Just thinkin'