graphical poetry

I've been using the format of the LJ icon like graphical Haiku. The 100x100 pixel and 40K file size limits are like line counts and syllabification. But an LJ icon, like a Haiku, has non-physical constraints. Mine have stories behind them. They're puzzles. They relate to the dual audiences of my close friends and random strangers on the net. I'm sure I could find other threads to tie them together.

I wonder how you'd formalize the stylistic aspect of the LJ icon art form?