I thought about that idea too, but it raised a question to me. Does Out of Space mean out of space for all pictures (Photo Albums and Attachments) or just attachments? If it means just attachments how many would make it out of space?
Our attachment album just grows and grows.? I would like to clean it up... but how?
The only idea I can come up with is to intentionally upload a file that puts you over your disk quota, thereby forcing the system to delete the old attachments. See Admin->Settings->Message Formatting->Out of Space
Whether this approach is truly ethical is another question...