photoblogs.org has a whole section devoted to photomemes. one that has caught my attention recently is the 800 X 600 project. from their guidelines:

The Project is open to all! Collages in this project are made up of 64 pictures total. All 64 pictures must be original photographs, taken by the collage's creator. Each individual picture in the collage is 100 pixels wide by 75 pixels high, oriented horizontally. Pictures should be arranged in an eight picture by eight picture grid, forming the final 800 pixel wide by 600 pixel high collage.

i may give this a try myself. some of the entries really explore a single object or theme well, whereas a few feel more like random shots just put together. i've just noticed that there hasn't been any new entries posted since 2003, i wonder if that means this meme is dead?