One can get hooked on making photo frames, LOL, I did.
Seems you never have the right one to match the painting.
Your lattice frame, would be a food one for odd ball antiques and rusty nail displays.
LOL, yes, nails, as in square nails, railroad spikes and other odd types.
Horse shoe nails.
Rusty nails are quite artistic, I think. Good idea. They would look nice with small shells, too.