ROY VAN DER WONING  No complaints, just an observation.

FWIW: I think this app is pretty cool. I already disabled the standard menu bar clock in favor of it.  
(Version 1.0)

GAZMAN  27 MB of real memory is nothing. A more relevant question would be how much CPU it is using while running.  
(Version 1.0)

ROY VAN DER WONING  Funny how you claim 27MB to be nothing and then worry about CPU usage for an app that changes your wallpaper once a minute.  
(Version 1.0)

XYPHER  What I meant was I didn't notice any system slow down or drag even though I am running 10.4.11 on an eMac with a measly 384Mb Ram.  
(Version 1.0)

MEATHEREDOTCOM  I don't think I'm revealing any great secret here, as just looking at the first few bytes of the file gives away the file type. Anyway, making clocks of your own looks relatively easy, though may take a lot of time. The .wcz file format is just a renamed .zip file (wcz=WallpaperClockZip?). Change the extension of a clock you like and unzip. You'll see a long list of mostly .png files, labeled by function (e.g. moonphase1,moonphase2, etc.), each with a small graphic in the correct location to build the overall background image. Make your own version of each graphic, edit the .ini file (also in the unzipped folder above), zip them up, and rename. You should be good to go.  
(Version 1.0)

XYPHER  Thanks for that Boss!  
(Version 1.0)