looks like a skin I'd put on my 3ds. I like space and abstract material. right now, I have a black old 3ds with a blue smoke skin on it, and a n3ds xl majora's mask edition. I bought a majora's mask gba sp to go along with it, and I'm using the Mario pouch from club Nintendo for it's pouch. my majora's mask n3ds xl is in a zelda hard pouch. the zelda image is a decal on a blue hard pouch (both came together, but you have to apply the decal yourself), but it worked out very well:
i have one. bit scratched up and the back cover has been broken off because i needed to get to the sd card with the screws stripped. besides that, it's in pretty good condition
i didn't even realize they were 'rare'. i got mine pre-owned at Gamestop.