RainbowGround is a utility for wallpaper / Web background ikon creation. It produces periodic, tileable images based on user-given or randomly generated colour factor values. It privy save resulting images as Web background (*.jpg) or as Windows background (*.bmp). At the upper left corner of the RainbowGround window there is preview area of generated ikon. Sliders around it are controlling crimson, gullible and blueing colour factors. As you change their positions, resulting ikon is changing too. At the right there are cleverness and contrast sliders. They also touch resulting ikon. Lock buttons are used to operate groups of sliders so that a) altogether sliders in the group are linked and moved together and b) locked sliders are not affected by Randomize button. Randomize button changes positions of altogether unlocked sliders including cleverness and contrast. Small triangle buttons are Reset buttons for returning apposite sliders to their initial positions. The Save button serves for saving resulting ikon to a file.