I currently use 6.3.1 on the
site I do webmastering for (actually, it's more of "webmongering"..)
Having gotten used to these forums, I made the recommendation of getting the UBB.Threads to my 'employer' for the site, and they made the purchase. I was suprised to find major differences between this version and my version- However, I didn't realize that the threads were under "different management", before the version that I got.
For modifying your forums, you can
1. Learn PHP. THe forums got me started in it, now I do almost all my pages in PHP. I've made personal mods to my forums this way.
2. Go check out
ThreadsDev. They have many mods, including Table wrappers and Image Borders, as well as add-on Image Libraries, New Index Pages, Chat-Room page, etc etc. You usually have to apply the mods yourself, but if you follow the instructions, it's simple and you can't really screw up. (Save backups, however!)
I haven't tries running the other forums out there, the only one I've had experience with was VBforums or VBthreads or something like that, and personally, I hate the feel of that one..
[Note: Regarding the spider, sorry, can't helkp you there. but.. is it in 3D?]
Me.