I have also recoloured some Doom/Heretic/Hexen flats to try and give a bit more variety. Some work quite well, others far less so.
Unfortunately, the enemy sprites are less useful. Their stark colouring makes them even less Doomy than the textures. That's not a massive problem for a complete EoB themed conversion. However, they don't have many frames at all. Their walking frames are just single images for front and rear (reversed to create 2 frames in game - but it looks bad because many enemies are asymmetric, e.g. the zombie's rotting leg keeps changing sides

Some of the static items (decorations, pickups etc) are more likely to be useful (indeed, I have already used some in my old Heretic Thief mod).
I don't know what I am going to do with the textures yet anyway.

Spoiler:Anyway, there are lots of interesting switches and wall gadgets of various types and the textures look quite good in themselves, so I might figure out something for them at some point.