One probably has to look outside of database fixes as some folks did with phpBB by creating an extension that runs hyperlinked http requests through an SSL image proxy server which rewrites them to https to appear as secure for viewing. I don't know if anything like this has ever been developed for vBulletin; but, it might be worth looking around for. If you find something, it might be worth bringing back the tip mug to pay for it. I suppose you could do a poll.
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... Background Information:
If a phpBB board is served from a https:// server, it will generally behave well as a secure site, but any image links posted by users as http://... will appear to browsers to be insecure content, in some browsers promoting a security warning dialogue, and in other browsers resulting in the image becoming inaccessible.
A direct solution of converting the image links in the phpBB database is generally impractical, so an accepted solution is to use a SSL proxy to make the images appear to be secure. Camo is an example of such a proxy.
With this extension installed, when a phpBB page is being loaded by a user, links to http://... images are rewritten so that they become https:// links to the camo proxy server, with the original link address encoded into the new link. The user's browser then requests the image from the camo proxy which accesses the original location and re-serves it on-the-fly using the https:// protocol. ...
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