They are easy to figure out, take a look at the Springfield Showcase section and look at other people's towns... Zoom in close and you can see what people did.
In all honesty, I probably overuse it. But here's something I'm particularly proud of. At the bottom of the pit are the melted Simpson snowmen. Sorry for the crappy resolution.
ETA: they really need to offer us half blocks.
http://i.imgur.com/6uzXLhS.png
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