Here is another set of macro photographs that have been formatted for a 16:10 aspect ratio (1920 x 1200) to match my widescreen monitor. So that they'll work with more "traditional" resolutions, I've also included links to 4:3 versions (1600 x 1200). As you can probably tell from the thumbnails below, these are images of fall. They were all taken with a Nikon 5700 in macro mode. I purchased a Canon Rebel XT a couple of months ago, but I have yet to pick up a macro lens.
The first three photos were taken this past weekend at a park in Redmond, Washington. I don't recall exactly where the other two were taken, but it was somewhere near Holland, Michigan.
You can get the first six sets here: Macro Wallpaper, Macro Wallpaper 2, Macro Wallpaper 3: Fallpaper, Macro Wallpaper 4, Macro Wallpaper 5, Macro Wallpaper 6.