I used to try and make desktop themes. It's more bother than it's worth to me now, but I still like pretty and unique wallpaper, so I will be adding to this collection.

I'm making these 1920 x 1080. They are usually easy for me to resize, so let me know if you need something different.
Click image to view. Right click on full sized image and "Save target/link as" to download.

1600 x 1200 (older & hard to resize)