One of the addons I have developed for AGD, Sprite Magic, supports four sprites sizes - 16 x 16 , 16 x 32, 32 x 16 and 32 x 32. I'll be doing a video on it soon but you can also take a look at the AGDX user group on Facebook.
I'm new to AGD and still getting the grips of it while I try to get my game finished. I would like to dominate AGD before I switch to AGDX. Anyway, I already follow your awesome youtube channel, so I'm not missing a thing