Well, here's my collection of Nintendo handhelds. I'm notably missing the Virtual Boy, but that system gives me a headache, so I have little interest in owning it.
These are all the carrying cases I use for my systems. The smallest case holds some extra Game Boy games:
I received an original model Game Boy back in Christmas of 1990 (along with my brother), but when the Game Boy Color came out in 1998, I sold my original Game Boy to some kid at my high school and got a Game Boy Color. I keep the Game Boy Color stored in this carrying case that you could only order from Nintendo Power's Super Power Supplies Catalog. I suppose this type of carrying case is hard to find now. I have a Four Player Adapter, but sadly, I've never used it.
Here all the boxes for the Game Boy/Game Boy Color games. There are several games that I used to own but sold somewhere along the line (like Baseball and Snoopy's Magic Show).
Here's my Arctic color Game Boy Advance that I got on the Game Boy Advance's launch date in 2001. I originally picked up the system with Castlevania: Circle of the Moon and Super Mario Advance. That was a fun launch, especially since the system only cost about $80 (don't you just miss the old low prices? I sure do).
Here are all the boxes. I could use some more GBA games, but most of the good games on the system are just ports of games I already own.
I keep my Nintendo DS Lite in this carrying case:
The 3DS is stored in this Pull and Go case. I really like this thing:
So that's everything. The 3DS is a work in progress, but I'll have to wait and see what good games come out for that.