I love building desktop wallpapers and collages for different projects. A fancy desktop of family photos, or even a quick and easy Christmas or birthday card for someone special.
While I usually use Gimp for this purpose, there is a great piece of software that you should try. It’s called Fotowall, and is available in your Software Manager.
After a quick setup, you can import any number of photos, and then resize them, rotate them and lots of other cool stuff! Add some text, which you can conform to any line or arc.
Once you are happy with your creation, you can export it several different file formats, ready for your desktop background or other purpose.
My only gripe with this software, is the lack of an undo function. CTL-Z is a wonderful tool when you are putting together images!