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Car trash cans - link doesn't work but looks like a couple fat quarters sewn together and then sewn around the outer hoop of an embroidery hoop and loop handle(s) attached. Use plastic grocery bags or small trash bags and secure in place by putting it around the inner hoop and tightening the hoops together.
DIY Trash Can Deodorizer- great idea, but 1tsp of any essential oil is too much. Use a few drops, if you don't enjoy the aroma of tea tree, add another scent, but keep the tea tree as it has antibacterial and other effects that will also help keep yucky smells away.