I'm not sure if anyone else wants to play, but since I bought my first external flash unit that I've had in thirty years, I'm going to challenge myself to a month of FLASH photos in January. Best way I can learn what I'm doing (frankly, the beast intimidates me!). I think the challenge can include any photos in which you used flash, strobe, masters and/or slaves, etc. In other words, you brought the light to the image. (So I guess that would even include shots made with homemade "studio" lighting which doubles as your desk lamp when not pressed into photographic service.)
Anyone up for it?