The map I made to base my other Ice Age Earth image on. I don't want to release the full res version of this map to the public right now, but here is a smaller 1024x512 version. This version only has 1/256th the detail of the original.
The ice is pretty simple to do in photoshop. I make a layer that's solid white. Clip the shape I want out of it, then overlay it with a mostly transparent edge detection of the black and white elevation map to texture the surface.
That's a good idea. I loved dinosaurs when I was a kid, I'm surprised I never thought of doing that. It'd be easy to choose which side of the world to focus the image on too since there would only be one continent. The question would be which era?