Your gateway to endless inspiration
Every once in a while, I decide I need to go back to Sans's sprite and re-decide how I want to draw him, particularly his head shape and eye socket shape. And then I usually go of the rails seeing how I'd tweak things for his variants, which definitely happened this time.
Red and Blue here are kind of just what I use as a default placeholder look for Reds and Blues in general -- they're not the canon designs or from any particular interpretation of their AUs, and that's true of Dust here, too. The Horrors are from two separate Horror AU ideas I'm kicking around, but they're very Halloween Town Horrors: they look kinda scary, but they're not malicious. And then Killer and Error here are pretty much straight lifted from their canon, visually.
The bottom set of four are from @popatochisssp and you can easily read more about them using her Undertale Skeleton's Master Post. Slate and Jasper are from Wave 1, and Ash and Brick are from Wave 2. I really like them, and I think you probably would like them too, if you don't aready :3c But if you're not into Sanses, or these types of Sanses, there are a bunch of Papyri and Swap / Swapfell Sanses you might enjoy! (Edit: fixed so all the colors have the appropriate hex code colors as assigned in their reference post.)
Sketches that I’ll never finish ‘cause, well, I got what I wanted out of them / got the concept out of my head enough to be okay leaving them messy or sparse. :3c