I tried the rusting fabric technique. I just wrapped some fabric soaked in vinegar and water around rusty nails, screws and an old tool. I like how they turned out. Before I use them in a piece, I want to try coating them with some matte medium to make sure they don't continue rusting. I haven't gotten around to doing that yet.
Although I like these pieces, I don't think I will be using them in my "play-along" piece for the Rusty challenge. I have something else started for that. But I do have an idea for these pieces.