You could actually use a "Lego" type system in photoshop. Make a bunch shapes (blocks) of different sizes and lay and warp them over each other until you see something sweet within the silhouette.
It works well to create nice silhouette and work out what the form is using your minds eye. What I like about going with this method is you can come up with ideas you orally wouldn't think of if you were just sketching because you break your normal rhythmic workflow.
Example is some of these ships I sketched
http://www.tomahawkmonkey.com/portfo...-work/13960837
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