My first choice would be some Lego, un-assembled in a bag.
I would then choose to send a star map if where Earth is.
Finally a diagram showing how to make a human figure from the Lego.
It would tell us a lot if the aliens either sent back the human Lego figure, or a model representing themselves.
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And what would it tell us?
It would tell us they didnt accidentally stand on a Lego brick barefoot, and interpret it as a primative act of war ;)
Seriously though, if they build the human figure it would show if they understood our basic concepts/instructions, but not necessarily that is how we look. If they built a figure in their own image it would show they understood the instructions was how to build our form, and that they wanted to communicate with us by sending back a model of their own form.