It looks like, maybe a rubber door mat....?
top of a patio table ?!?
a storm drain?
Ah phooey...Susan beat me to it...was going to say trivet. Well how about an ornate register cover?
I'm with Jill. A register cover?
Great guesses, and several of you are pretty close. I won't reveal it quite yet. :-)Michelle
car mat, floor vent, door, or a fence????
lattice? door, fly swatter, we need a clue, maybe the dimensions?