SwapTop

SwapTop brings a world of pictures to your Mac, letting you start each day with a new and exciting desktop picture!
SwapTop allows you to schedule changes to your desktop picture, and can display both your personal collection of images (e.g.

from iPhoto) or automatically download new pictures from the SwapTop image server. Furthermore, SwapTop supports Picture-in-Picture allowing you to display additional images as Overlays that float above your desktop, but below your desktop items. You can display as many pictures as you like, at any size you want, placed anywhere on your desktop. Happy thoughts and special memories displayed on your desktop just the way you want them.
SwapTop also contains a free "screen saver" module, allowing your SwapTop pictures to be displayed at full quality when your Mac is idle.
SwapTop 2.1.1 ensures compatibility and support for Apple's forthcoming Tiger release, and also includes a number of minor bug fixes.
Previously a SwapTop 1.x user? SwapTop provides additional support for SwapTop 1.x users who decide to upgrade and to show our appreciation to our existing customers, SwapTop 1.x users will receive an additional three months access when upgrading.