"think yellow for UVs might not be the best colour, since it’s very bright and on a lightmap you’re often dealing with white areas. Maybe a just-slightly darker green?" - Ciro Continisio, June 2020

Accessibility should always be considered for our interface and colours should always be made adjustable. Please supply a colour picker for users to pick their own colours from the Preferences window in the Color tab.
Bonus: Make the default better colours.