It is one thing to do the photoshop tutorials and another thing to be able to recreate the work from memory. In this one I tried to combine past exercises …. the the knife, the wood pattern, and the wrinkled paper.  click it to enlarge.

Source: http://psd.tutsplus.com/tutorials/drawing/create-a-knife-in-photoshop/ Learned the ctrl+j shortcut to duplicate selection to new layer. Good pen tool practice. Adding noise with motion blur makes the striations on the blade. Gaussian blur gives the whole thing a bit of glow. Stroked paths make the crack in the wall. Dodge and burn tool on the handle to shadow it.