Swirling Springtime Zephyr

Using Photoshop CS5.1 I put down some white, blue, and green stripes, then with Filter Forge I made a seamless square 900x900 using the filter "Circular Tunnel Prospect", which added some yellow. This is free to download. It will tile seamlessly, especially if you shrink it and keep copying and pasting it into the size of digital canvas you like.