Disclosed are a system and method for computing a desktop picture. Instead of loading a file that contains the desktop image from memory, the present invention provides for a system and method for opening and retaining a procedural recipe and a small set of instructions that can be executed to compute a desktop picture. The desktop picture can be computed very quickly using a GPU (graphics processing unit), and can be made to move on demand. When a part of the desktop image is needed to composite, that part is computed using a fragment program on the GPU using the procedural recipe and a specially written fragment program into a temporary VRAM buffer. After it is computed and composited, the buffer containing the result of the fragment program may be discarded.