Here are few initial concepts for your contest! I've tried to incorporate leters "E" and "C" in a subtle and simple way. Simplicity/uniqueness of this design's logo icon, makes it very recognizable/memorable, and therefore, quite brendable! Hope you'll recognize branding potential behind this visual identity! Feel free to suggest improvements! Thank you!
Regards, Bojan
P.S. My favorite so far would be entry #125, or its "softer" variation #131!