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Tips for reusing empty tuna cans from the ThriftyFun community. Post your own ideas here.
You could do something similar with green fabric and ribbon and a couple pieces of green felt to make a turtle.
They also make good trays for painting, especially for small children. They can swirl the brush around enough to get the desired amount of paint without worrying about spilling it and making (as much of) a mess.
They're also good for making poached eggs. Float them in boiling water, then crack the egg into the can and cook to desired doneness.
My mom uses one as a water dish for her cats.
I use mine to attract birds outside. I fill the old tuna cans with bird feed. I then hang then on a hook steak that I got at the dollar store on sale. Just drill four holes in the can sides, then hook a chain thru them, and hook the chain to the hook. Birds land on the cans and feed from them. The hook and chain length helps keep red squirrels, and grey ones too out of the bird feed. I have yet to keep out the black birds though. They are trying to starve the nice birds that are pretty out. The gluttons!
Cut a long strip from a pasteboard box, the width equal to the depth of the tuna can. Roll it tightly to fit inside the can, leaving a point of the end in the middle. Pour melted wax on the cardboard and let cool. You can take these camping, place stones around the filled tuna can, light the cardboard "wick" in the middle to start the tuna-can-burner. The fire should last long enough to cook an egg breakfast.