We need better default profile pictures. The default ones should be like the avatars in chatrooms (like Mario, Sonic, Pikachu, Link, etc etc). The game consoles and things are poor quality and unflattering.
And better default wallpapers. The ones that are currently there are okay, but we should have much better ones to choose from.
Plus, the blue gradient wallpaper was made for DSi, so it looks janky on 3dspaint. Either fix it or rid of it.