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This is a derivative from Nudel_P's http://www.thingiverse.com/thing:15449
Here I have cut my favorite part of the model in Netfabb and used blue and green filament during the print. Swapping the colors at the selected layer height was possible with Jetty's firmware.
I have also used Mineways to export a model.Mineways allows you to export your Minecraft creations and print the .stl out!
I printed mine at .2mm, 120mm/s accelerated, 10%infill, 1 shell, and maximum build size of my TOM.
In order to get the desired 2 colors for the water and land, you need Jetty's firmware if you have a TOM or Cupcake. Swap your filament at the desired z position or manually pause the print and swap.