You will find a variety of images and Weidemann desktop backgrounds here. The designs are available for download in various sizes. To do this, click on the size that you want to download. A new browser window will open with the image in full size. Use the right mouse button to "Save image as ..." in order to save the image locally.
The images are of course available to you for private use free of charge. Please note that a commercial use may not take place without the consent of Weidemann!