Decalmachine ($30)

decal.jpg-ELEULQnO6jnww7P-md

a blender addon, which through mesh Decals, allows for surface detailing in a very non-committal, non-destructive, UV-less way. And as such, it represents an alternative approach to hard surface texturing.

https://www.youtube.com/watch?v=TU8v5YJ__go&list=PLcEiZ9GDvSdWiU2BPQp99HglGGg1OGiHs