Free Wallpapers. These were created in Apophysis, which is a free program.
http://apophysis.org
I never know what they will look like when I start. I let it make a random selection and then I start dragging the triangles around. If and that's a big IF, something nice comes out of it, I will let it render. The rendering can take several hours. The preview gives an approximation, but I never really know how it will turn out until it is rendered.
All files are 1920x1200 or larger. They should look O.K. on any wide screen monitor at that resolution or lower. View at Original Size and save that version. I do look forward to them releasing a newer version that will allow me to make them a lot larger. Scaling down is easy, but you can't scale them up.