http://www.macnn.com/articles/02/06/10/desktop.photo/
Desktop photo management with SwapTop
updated 08:10 am EDT, Mon June 10, 2002
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SwapTop 1.7, an update to Zonic's $15 shareware desktop photo management utility, allows Mac users to set up a schedule to automatically select a random desktop picture, to download new pictures from the Webshots network each day, and to search online for new images. Version 1.7, adds support for higher quality images for "Webshots Unlimited" subscribers, allows image aspect ratios to be preserved, adds a Dock menu to set the desktop picture on OS X, and fixes a bug which could lose user login details.
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Joined: Jul 2001
If downloading not needed
If you don't need the downloading capability, you can get much of the remaining functionality using ChangeDesktop, which is freeware (available on Version Tracker).