Icons based on the free fat cow web icons from the mid 2000s. http://wmh.github.io/hunbook/tools/fatcow-icons.html

This is based on SD 1.5 so it’s more neutral. I also have a Pony SDXL version that’s more attuned to furry stuff.

512x512 gives you 32x32 pixel icons

1024x1024 gives you 64x64 pixel icons

You might want to feed a grid into the prompt with control net if it's being weird about pixel sizes, but the overtrained model does much less of that