Interesting idea. Instead of a full game, maybe just a "builder" app. Basically, it'd let you build in slate using "tap to place" controls. There would be no avatar you'd control. When you're done, you can save it to your iDevice, or you could export it. If you export it, it sends a save file to your email that you can drag and drop into blockland. I already have controls worked out so that they'd be simple, yet functional, but I don't want to take the time to explain them all right now. I might draw a diagram later.