I have a white 3ds Xl which I have put animal crossing vinyl stickers on and on top of that I have a clear perspex case to keep it all in good condition.
I usually play on my Pikachu XL console, but in this forum, I have the friend code of my Yoshi console, so when I ask for help for signatures and such, it's my green cutie the one I use
I have two 3DSXL. One is blue and the other is red. I have Nintendo 3DS XL Duraflexi Protector in matching colours.
Read that it also comes in Clear so you can see your custom 3DS but can keep it safe.
I also bought a Comfort Grip by Dreamgear for my sore hand. It helped with my bad hand.
I also just picked up a nerf cover that I haven't tried yet. It looks like the comfort grip one.
I do have matching hard carrying cases that I used at the beginning. It protects the 3DS and you still get streetpasses