Speaking of cheap shelving that works wonders. I upgraded my Castlevania shelves to a stack of 4, instead of the original 3! Things look a lot nicer now that they are spread out a bit more.
And, I was at the folk's house today and found my old Toys R Us advertising posters. I thought these got tossed out years ago. I have ones for Metroid Prime 2, Metroid Zero Mission, LoZ Four Swords Adventure and Jak II. But I didn't snap I pic of them... Basically they are 3x4 ish posters of the box art, made of a plastic sheet. Pretty sweet.
I hung up the Zelda and Metroid Zero Mission posters in the game room too.