I just posted a couple sets of parchment textures at the GM's Apprentice.
They can be used as backdrops for maps.
These are high enough resolution and large enough (3000x3000) that they are also suitable for using as backdrops for handouts. I also included some 2400x3000 images (presized for 8x10 inch handouts)
If these are useful, I will develop more parchment packs.