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LOL...I mean yeah, colored seat belts would be great and all, but I just laugh for me that's pretty far down the list of things I think it would be nice to have options on.
How about...
More exterior colors (lighter/brighter blue, silver, some kind of green...)
More interior colors (saddle brown? red? gray? seat contract stitching?)
Adjustable suspension (comfort vs sport)
Ambient lighting (yes, I know it's coming...late)
Cooled seats (again, late)
Other wheel styles
Heads up display
Powered frunk
A cargo cover that doesn't suck
Just to name a few. Obviously I knew all that when I made my choice, but still.