ripBenNZLI made some current weapon icons from the ones used in the backpack. They can be extracted from tf2_textures_dir.vpk/materials/backpack/weapon/c_models and don't need any editing.
https://www.youtube.com/watch?v=otGfeCiU_mU
I really liked this idea and I didn't see a download link so I've completed this if anybody is interested.
Download
The only downside is that multiple unlocks share the same tf_weapon_....ctx file as seen here so I could only use one image for those.
Sorry for posting in such an old thread, but does anyone have these? DL link is broken