I need some drawings done in a unique style

Information for the business: Industrial valves and steam pipes
Design details: We are looking for someone to take our existing drawings and give them a unique style that will match our business and differentiate us from the rest of the companies in our industry so that when someone sees the picture or artwork they will know it is our company's.
Target audience: Engineers
Ideas for the visual style: Sizing sheets
Things to avoid: Being boring
Preferred colors: Grey, blue, green
Where the design will be used: Web and print
Extra notes: Attached are the drawings that I did myself. I was thinking if you made the background darker then it would not be so generic and it would possibly be better for blending colours. I am not artistic so take my advice with a pinch of salt.
We are looking for a clean, professional, neat look.