duh duhn shh.
But yeah, a Mario Paint DS would be an excellent idea, but they would have to add a lot to it to make it not just the paint prog in MKDS and ACWW.
If you're thinking of what I think you're thinking - it was in a mag (EGM IIRC) but I believe it was a goof/speculation of what Wii games could potentially be. A Bob Ross 3D paint game using the Wiimote.