I'd say they are art, the skillfully done sigs.If you can say they're not a form of "real" art, those who say they're not, show me a brilliant sig then that YOU made. Some of my sigs can take over an hour or two to do, and I daresay they're not MS Paint crap. I agree that sig threads should be limited, but to ban them all together is not fair.
If you won't let one form of art be allowed, who's to say you won't ban another? Photography? Oh, you only press a button and shoot a photo! That's not art, let's ban that too! And vector art? That's LIKE graphic art. BANNED!
See what I mean?I like Black Mage 121's idea. One giant sig thread is good. Though the Art forum doesn't seem too clogged up in my opinion.
EDIT: The proper term for painting and pencil and paper art is TRADITIONAL art, not real art. No one can say what is and is not art.