Colors! 3D is the heartwarming story of how an unofficial, homebrew DS app "graduated" into a for-real downloadable 3DS eShop game. It's also an app that allows you to draw and paint on your 3DS, and share your drawings online with the Colors! 3D gallery.
Other new content on 3DS this week includes a video interview with Warren Spector about the two new Epic Mickey games, and "The Rifle's Spiral" by The Shins (available tomorrow).