Stop holding your Nexus 7 in your hands like a chump and check this out. These industrious modders have built and installed complete Nexus 7 mounting systems in a Subaru STi and Toyota Celica. The Toyota owner even created a launcher skin to go with the mod. The skin, of course, is based on Knight Rider (seen below).
The modder with the Toyota used Nova Launcher, UCCW, and Simple Text to build a simple Knight Rider UI that gives access to the most commonly used functions. Having something like this in your dash is probably not the safest thing, so cutting down on distraction is a good call.

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Check Out These Super-Clean Nexus 7 Custom Car Mounts was written by the awesome team at Android Police.