I am a big fan of the Youtube channel My Life in Gaming. Their video about displaying their GameBoy cartridge collection got me thinking. I made this tiny shelf. I didn't stop there.
Full size shelves, for a real collection was the next step. Ikea does not sell these, but I'll share the plans if you want to make them. These can be built in a day for under $40 per shelf if you have some common wood working tools.
If you think free stuff is nice, may I draw your attention to the donate button below...