I think I've got it! Last year I got some old soda fountain spoons in thin metal. I didn't know what I would do with them, they just appealed to me. One of them is now transformed, painted with layers of acrylic. the thin metal helped because I don't have any jewelry tools like round hammers and so on. So I was able to use a regular household hammer to flatten it a little.
The second piece is an old tin box cover.
Art on a shoestring can really be satisfying! If the budget is tight, you can always find a way!