Steve  Wessel's Desktop Background Loader works wonderfully.

http://squeak.preeminent.org/

I wrote a blog post on how to install it here:

https://timmydosmalltalk.wordpress.com/2013/06/20/setting-a-background-image-on-squeak/


I am able to set a different background per/project..I run WindowMaker window manager and their Themes are quit rich.

You may want to provide the Background Loader by default and then provide some optional "themes" for users to download.

cheers.




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