Sometimes when you are working with Blender you want to render a beauty shot, but want to also show the wireframe of the model you are working on. This video shows that process. (As an added bonus, it also shows how to enable wireframe display while in Object mode in case you were wondering how ).
Select the Object you wish to render with a wireframe overlay:
Hit Shift + D to duplicate it.
Select the material on the wireframe and make it unique.
Select a diffuse color for your wireframe. Optionally enable emit if you want the wireframe to glow slightly.
Add a Wireframe modifier to the copy