My espresso machine came with a lovely plastic tamper, that looked like this:
I am not all that picky aesthetically speaking, but that tamper is absolutely ugly and does not fit the cup snugly enough. Its outer diameter is about 1/4″ smaller than the inner diameter of the espresso reservoir. I thought that making a new tamper would make an interesting turning project. Then I thought that the business end of the tamper had better be metal.