You just reminded me of the time I was there in late October, and when we rounded the corner, sitting on Table Rock was a Jack-o-lantern wearing a hockey mask!
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That would certainly get your attention, especially if diving there alone and not expecting to see anything like that!
The closest I've come to seeing anything like Jack-o-lanterns in a cave were some plastic or ceramic skulls stuffed away in the lower bowels of Devil's Den, and that was this past summer. Nowhere near Halloween.
On 10/4/08 we made 2 dives at Little River - made it to the back of the Florida room.
Moderate flow and vis 40 feet. Basin is clear.
Ditto to the above post.