Well, I checked another code-project (where I'm the owner):
Max upload size: 100 MB.
Your project is using approximately 9.7 KB out of 4096 MB total quota.
=> files are maximum 100MB (no problem I think), and total amount of data we can upload is 4GB (so that's also enough I think)
But the whole code-things is just made for programming together...
=> downloads are just listed (I submitted a picture in my code-project, no thumbnails or something alike): then I think something like DropBox is equal in usability (except for not all artists loving DropBox

)
=> issues-tab is to post bugs (how to reproduce, etc etc - not focused on posting artwork-suggestions...)
=> wiki-pages are static pages, with just some info (equal to our PCLinuxOS-wiki)
: however it is possible to add images to the wiki-page (so we can share our thoughts there, incl. images, etc...)
=> source: submitting and getting the project-code at once (can also contain pictures) -- but then everybody has to have work with subversion or another versioning system.
Maybe that's what you want (there are some simple tools for it in the repository): people can change a file, or commit a new one; and everybody else will get that changes by 'getting the latest version'.
But no gallery on the place itself (or canvas, or whatever you call it)
People also need a Google Account (however they can keep their own mail-address with the help of following link:
https://www.google.com/accounts/NewAccount)
We
can't stay using this one:
http://groups.google.com/group/pclinuxos-beautification-2009;
because within some months, uploading files etc. won't be available anymore
Even existing files will be removed (extra warning for the people who worked there once!!!)
Maybe we can use
Google Sites?:
https://sites.google.com/site/pclinuxosbeautification/home (just an example, nothing final!!! - I'd like some shorter name, but I do not have any fantasy at the moment

)
=> here I just have to add some editors or owners (the artists...)
:: We can have a separate 'file cabinet' with all files, which we link to from other pages... or just upload images to a page (e.g. "wallpaper heart beat"

- where you can find progress, or asking for help...)
Also an Announcement-page is possible, or a 'List'-page to track various things...
It is also possible to collect ideas/requests from people:
http://sites.google.com/site/sitetemplateinfo/tips/work-with-forms=> not a 'contact me' but an 'idea' page

[ I haven't add such forms at this time ]
=> this way it's also possible for new people to ask for registration as editor / owner...
Some examples (this is really an
ugly site...):
https://sites.google.com/site/redmille/formulieren(just open the whole site, there is also a file cabinet, a guest book, etc... -- sorry, but it is in Dutch (and a little bit in English...

))
One
warning: we only have 100MB here!
=> this can be solved by using a different file storage, e.g. here:
https://docs.google.com/leaf?id=0BwCz_TX4tzJWZTBjOTc3ZTAtY2EwZS00Njc4LWE3YzAtMzJiMjNlZDMxNzQ1&hl=nl(where I also can add the people working on the artwork - or that even can be at Archies docs side; just what we choose;
or even something like Dropbox.... -- because Google Docs is limited to 1GB)
=> maybe it's even possible to use the code project where we have 4GB of file space...

Another possibility is adding a group on kde-look.org or something alike...
::
http://kde-look.org/groups/?mode=0=> I didn't take the time to test that one... (maybe someone else has experience with it?)
: but I think this is very public (all things you do are directly visible to the whole world - everyone who visits kde-look.org; or is that not true?)
So we have many choices (maybe other people around here have even better suggestions -- please let it know

)
And, Archie, I'd say it's up to you what you want to choose... (I have no real preference
=> I'm willing to help building up the central artwork place - but I have to know what you exactly want
(else, if you say: I want to use this technology (e.g. google sites), I also can just make something, add some editors and owners (incl. registration possibility); and then afterwards everything can be changed (just to make it practical to use)...
Thanks for reading this long post

(my longest until now I think

)
And throw in your ideas please!