And of course, you can do this with any picture.

I still want ingame bump-mapping.

the only thing bump-mapping does if you turn it on is make the blood bumpy on the floor.

No, it just allows bump-mapping.

The thing is, you need to map your textures first, and thats not that easy.
If you know how to, you can just do that, and you'll have Bump-mapping.

Hmmmm... I will try non-the-less.