We were given a mundane location (school atrium) as the location in which we (30 students) were challenged to produce a unique image. Instead of taking pictures of garbage cans and chairs I found a little access panel. Inside was this nice solder splatter. It could use more DOF. I'll keep it in mind for next time.

http://morbo.net/misc/Misc_04-11-07/imagepages/CRW_7440.html
Shot at 180mm 1:1 with 68mm of extension tubes = 2.65x magnification (with crop factor on top of that). f3.5, 1/60, ISO 200.