As a kid in the 70's I collected Wacky Packages stickers before video games kicked into gear. Had Atari Pong, Video Pinball and Stunt Cycle consoles before getting a VCS.<br /><br />I still collect the Wacky Packages cards.
Those old wooden cassette tape holders work well. Sizes vary. You just pluck out enough of the slats to configure your cartridges how you like them. The larger ones can get heavy when full, but with some proper supporting brackets you could hang them on a wall.