In 2013 I had the pleasure of working with the Asheville Startup Weekend organizing team. I developed a logo in various formats:
Notice the nice halftones in the B&W version? Here’s a great Adobe Illustrator tutorial on creating vector halftone effects.
The part of the logo including the beaker with the little people bubbles and the word “Startup Weekend” are supplied by the founding Startup Weekend source, and must be included, but the rest of the logo is my work.