Here are the photos I submitted:
Squirrel Posing, 11x14
Class 1 (Color), Lot 1 (Animals)
Handful of Baby Bunny, 8x10
Class 2 (B&W), Lot 1 (Animals)
Goat Kissies, 4x6
Class 1, Lot 3 (Photojournalism)
Class 1, Lot 5 (Still Life)
I'd Give It All Up For Love, 8x10
Class 1, Lot 6 (Architecture)
Avenue C Railroad Bridge, 16x20
Class 2, Lot 6 (Architecture)
The squirrel and railroad bridge pictures I had printed at Costco on poster board ($10 and $15, respectively), since I think those are my best chance at winning. The others I printed on inkjet photo paper and mounted on foam board. That was rather a pain in the ass, but I saved a lot of money (my cost, about 60 cents each).
The baby bunny pic I applied a blue filter and converted to B&W. This made the skin on my hands look much rougher, which I thought contrasts nicely with the soft bunny.
The railroad bridge photo I ran through an IR filter, which did a much better job than just a simple B&W conversion. IR helped make the leaves on the trees to stand out, rather than turn dark as ordinary B&W would do.