Inktober on a DS?! Why not! With some homebrew DS apps and a flash drive to load them anything is possible. Here we go...
And there you have it. Next year: Inktober on a GBA.
Also be sure to check out the 'real' Inktober project of the year here, all drawn with a Wacom and Flash 8 rather than a DS and wet Paint. Some of these were based on some of those.