Here's an interesting thing to try if you store your images (or information about your images) in some kind of database.
Brooks Jensen recommends adding three extra fields to your image database:
Distance to Subject: infinity, 20-50 ft, 10-20 ft, 3-10 ft, under 3ft, macro, super-macro
Colour: warm tones, cool tones, saturated colours, pastel colours, monochromatic
Composition: round, diagonal, T, L, random shape
He says it's useful for identifying what types of approaches you favour for various subject types, and can help you identify new ways to approach old subjects to help you break out of a creativity rut. I guess it can also help when you're trying to find groups of photos that will go well together, such as cool-toned macro shots.
Listen to Brooks' audio blog entry on this page:
http://lenswork.com/stl-web/b2/index.php?m=200411