I'll have to post up some pictures of astronomy-related papercraft models that I have made at some point, but for now here is a link to a few different papercraft models of the planets. I need to go back through my resources because I know there are a bunch of sites out there with some easier to make polyhedral models. Also, at some point I'll put up the models of planetary bodies that I have mapped and labeled myself.
Here are a few pictures from the site. Click through to download and learn how to assemble.
Looks like they are using Nasa's Blue Marble Imagery:
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