Yeah I'm using normal maps as well for the textures I've got. Not sure how to make normal maps on my own if they didn't come with the stuff I downloaded, but they did so I don't need to worry bout that for now. In Blender you can use node trees and mix shaders to basically tint the textures to the colours you want (within reason), it probably affects their overall fidelity up close maybe, but that won't matter for me.