How can I upcycle old rusted bent nails of all sizes for a project?

Put them inside an old picture frame and then pour resin over the entire thing. Depending on if you have glass or matte board under the nails, it can be used as a table top or if glass- hung in a window.

Hi Cindy,

Stick them around a mirror or picture frame randomly or in a pattern. Decorate a Box or a table or make a picture - modern art or traditional.

You could leave them in vinegar and use the liquid as a wood dye (the more layers you paint on the darker it will be).

You could make coasters or other surfaces if you add a resin and place in a mold of some kind to retain the resin whilst it sets.

Have fun................

Make a side table cover the top and cover with acrylic the nails will come through and look cool

Recycle them.

Maybe you can glue them into a shadow box for display.

13 Amazing Rusty Nail Repurpose Ideas

https://acraftymix.com/rusty-nail-repurpose-ideas/

Make a collage with them.