I recently released a map centered on the idea of a game taking place inside of a huge globe: I will soon be releasing a canvas version after I've worked out the kinks. I might be in need of some testing if anyone would like to join! Feel free to download the original to let me know what changes you would like to see!
http://www.forgehub.com/forum/reach-casual-maps/105946-cerebrum.html Here's where you can view more screenshots and download the original.