I didn't add it to the New Body panel.
I added text boxes where you can type in the name of any texture or model.
To create this scene I opened up Earth & Moon (a personal favorite for testing), then typed in 'forestmoon' and then 'dice'. The file extensions are added automatically.
Whoa that's awesome. Though you might need to change the name (Color; the yellow-ish one).
What do you mean by change the name?