Entry #31 is a very cool design. It reminds me of the old school blueprints that were actually blue and white. Now it's rare to see anything but black and white prints on most projects.
The hoisted steel beam probably evokes a steel company or iron worker installer more than what we're going for, but it's still one of the best designs we've seen so far. I'm trying to think of an image that could be more applicable to what we do and will let you know if I can come up with anything. We specialize primarily in the consultation of the structure (concrete and steel) and shell (windows, brick, etc) of buildings, and retrofit or improvement of the shell. Not sure how that can be incorporated.
Also if you want to explore the blueprint concept further, here are a couple images to give you an idea of why your submissions reminded me of old prints:
http://arrowheadaddict.com/files/2009/01/blueprint.jpg, http://www.cets.sfasu.edu/story/buildings/04/images/Rusk-Blueprint.jpg .
Nice work so far.