No need for uv mapping to add textures. There is a material tab down under the edit button shaped as a ball. choose one object or several and click that. Now you can push add new to get material aplied on it. You can make it in any colour you wanna. Then there are several options there where you can make it reflective or see thrue. You can also apply prosedural texture such as stone or wood by choosing the thingy that looks like a cheese ful of holes. Just play around and see what you get. :)