It will change your wallpaper.

Redecorator is a wallpaper manager, or randomizer, and fractal image creator. It creates countless beautiful fractals that cycle through on your backgrounds. Best of all, Redecorator was designed for Windows XP/Vista/7, guaranteeing hassle-free installation and setup.

Also creates seamless tiles of your own pictures.

Redecorator

 

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After you install Redecorator, you will see the Redecorator icon in your system tray.
Right-click on it to select Redecorator Settings. You can choose which of your pictures to show, or just choose fractals. The slider lets you easily indicate how much you want to see of each.