When it comes to Photoshop, if you can imagine it then you can make it. Of course, more complex objects (and more realistic objects) take longer to complete, but the results are totally worth it. Just check out this lifelike coin, for instance. This Photoshop tutorial will teach you how to produce realistic coins via applying textures to a 3D cylindrical object.
Learn to make your own money in Photoshop! Bert teaches you how to make coins by applying textures to a 3D cylinder object. Make sure to gather images of the front and back side of the coin you'd like to replicate.