I know this is near-useless without pics, but I figured I'd try. Today I stopped in at my local pet shop for bedding, and this HUGE corn had just been brought in as a surrender/adoption. The guy said she was close to 6' in length (and looking at her, I'd just about believe it), assuming female. She was light and dark grey, with round yellow spots near the belly. Her patterning was fairly nondescript, mostly just regular stripes.

I know I've seen similar coloring on corns before, it seems like a fairly common morph I think. My phone is crap and can't upload pics. I'm going back on Friday with my bestie, who'd been thinking about getting a corn. If she's still there we'll give her a better looking-over, and maybe bring her home. She seemed well-cared for, the previous owner brought her in with her setup, a large-ish (20-30 gal) glass aquarium with deep bedding and lots of hides and decorations.