If you still have some room left above your bed to hang some posters next to the C++ Lands one, head over to corkami's account on GitHub to download or buy a whole collection of ultra-nerdy posters. Each one describes a file format: BMP, WAV, ELF, PE, Mach-O, BZIP2… Everything you had no idea you had an interest in is available over there, just for you. If you're not a fan of posters, don't despair and buy a t-shirt, instead.

Also, this.