Rather than mapping out large regions I went for a stripped down, functional look partially based on Adobe icons while using the Segoe UI font installed with SWM.
I took advantage of the png format to make the icons partially transparent and placed sub icons in the upper right corner for applications and rss feeds.
The headers on each home screen are widgets as well. For example the system header pulls open the Market while the people header opens the contacts app.
I tried it with filled icons but I like the empty icons with borders. The thing I really like about this approach is I can include live widgets on the screen that look organic to the overall design:
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Another neat feature that I didn't know at the time- the Simple SMS count widgets display counts for the buttons in the tray as well as icons created through the Desktop Visualizer app.