speaking of free images - go download yourself an april calendar for your computer wallpaper from smashing magazine. they feature FREE wallpaper images from designers all over the globe. some of the designs are really cool, which you can get with or without the calendar to use well beyond our april SHOWERS.
i'm currently enjoying the MONTH CAPSULE.
they also have lots of other free images... like blog headers, icon sets, and rss feed icons. neat-o.