While looking up the butterfly projection of the world, I noticed that the flat edges would be easy to cut out with tabs and glue together as a 3D globe.
It's not the prettiest globe, but easy to make. Certainly truer to a three-dimensional world than the Mercator projection.
Step 1: Find a Butterfly Projection of the World
Search online. There are lots. Here is one I found on the xkcd forums.
Step 2: Print
Make sure to leave enough space around the edges of the page to cut tabs.
Step 3: Cut
Cut tabs as shown.
Step 4: Assemble
Use tacky glue to fold the tabs under and watch as your globe takes on round-ish dimensions!