Lol, just realized that OP wasn't asking for storage options... Oops.
Anyway, I originally intended for my storage to be custom-made, but I settled for bookshelves from K-Mart because I'm a very lazy boy. They work great for the price, but I recently made some alterations to better fit my PS1 and PS2 games, freeing up space in the process.
Before I settled for bookshelves, though, I used to store/display my games in my media cabinet. Once my collection started growing, everything was stored in boxes and my room was a mess for nearly 2 years.