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In the first edition of The Design of Everyday Things[0], Norman has a photo of beer tap handles on control levers in a nuclear power plant control room. This was done, to differentiate two important handles.

I won’t link to the photo, because it’s on personal blogs, and I don’t want to hug anyone’s site to death.

The photo was removed, in the current version.

[0] https://en.wikipedia.org/wiki/The_Design_of_Everyday_Things

I've seen pictures of the cockpit of a large plane where the gear lever has an actual wheel on the end of it.

I think that is exceptional good design.