Nintendo makes the best handhelds. Even in spite of their technical inferiority to Sony, they always make games that, to me, are just more fun. I do love the Vita, but Sony seemed to heavily invest in killing it, almost as soon as it launched. I digress.
Instagram has a really strong community of Nintendo handheld modders. I got this Game Boy Macro from Obirux a while ago, and it's brilliant.
I took this picture of my Nintendo handhelds on our new kitchen counters. Obirux reposted it to his account and it got a few more likes than it did on mine.