If you want to dig into TVML a little further, Jameson Quave has put together a 2 part tutorial on getting the basics up and running. It's going to be interesting to see where the boundary lies between TVML and TV UIKit as we all get to grips with the platform.
I really liked this control from Danil Gontovnik which implements an incredibly clear and usable design for switches, inspired by Runkeeper. This would be useful both as a switch and also as a replacement for a segmented control.
Update: I had a quick note from Mike at Runkeeper saying the original inspiration was taken from NYSegmentedControl which is worth mentioning.
Jonathan Wight with a document on some best practices for coding in Swift. I really like that this doesn't dip too deeply into "Style Guide" territory, and instead defers to the Apple documentation on that. There's some solid tips for creating readable, clear, consistent code here. He's also looking for contributions if you fancy chipping in.
Linda Dong with a set of iOS UI experiments written in Swift. All of the code is available on GitHub and will make a good resource as it grows.