Logo design for startup mechanical engineering consulting business.

Hey, I am looking for a creative, innovative logo designed for a start-up business operating in the HVAC drawing and mechanical engineering consulting industry. The company will be specialized in drawing HVAC systems for buildings of any size with a particular accent put on "sustainable building" or "green-building" standards and procedures. I thus need to have an environmental aspect to the logo. I have found the attached image of a leaf on the net, it shows a couple of buildings and their shadows organized so they look like a leaf. I want the logo to either be a slight modification of that image, or to be inspired from it. I was thinking about mirroring the leaf to it looks like it's curving the other way, and I want the name of the company (a four letter word that I will disclose to bid winner) to come from underneath the leaf. The winner should provide 3 different designs. Suggestions and ideas (as long as they are creative) are welcome. Sincerely. A.