I couldn't find any decent spell/action icon resources for modding, so I made my own.
These are all the icons I could find in the game, cut 64x64 and ready to be tiled in your own mods .dds.
In the optional files are some assets I've been working on, including a backdrop for action icons and spell icons.

I hope this helps anyone else struggling to find modding resources.
All credits/ownership to larian.

Cheers