I love these tins. They come in all shapes and sizes and they make great frames ( well I think they do!!). This is a project that can take as long as you like or have a quick end result.
You will need a tin, I have used a M&S plant based mushroom one . Give it a good wash. Some paper, glue, scissors and paint ( or whatever medium you are going to work with). I used the base of the tin as an indication of the shape but mine came out too small, so I would give it some extra room as you can always cut it down.
Now the fun part to design your image. So I have done a pencil sketch and then acrylic to paint. Obviously you can use any medium.
When you have finished cut out and glue into the tin. I think they would look good as a collection using different sizes and shapes. Have fun!