I'm just thinking out loud here...
One solution may be to create an "Image Gallery" forum. Each "topic" would be for an image post. Instead of hosting the pictures here, the pictures could be linked to an outside photo source. There are LOTS of free and reliable image hosting sites such as the previously mentioned Flickr. If Flickr is utilized, an "Amiga.org" photo pool could be set up that users could add images to. A widget could be created on the home page that randomly shows images from this pool. Not sure how difficult that would be though.
Pros:
- Easy to implement, just add a forum called "Image Gallery"
- Image storage is external so no extra space needed
Cons:
- Users need external accounts to image hosting sites
- Posting an image to the "gallery" is a multi-step process (upload to hosting site then post here)
- Lack of control over the external images... if the external site goes down or its structure changes, the image links may break completely