p.s. don’t be afraid to use more colours, just pick a complimentary colour pallette. colour recognition goes with the others to help differentiate. since orange is used so much it has become a standard colour (not a stand otu colour) so you need other colours to help standing out.
X-Y-Z axis translate rotate and scale should all use Red-green-blue (nice hues of these though) for consistency.
create four standard colours, red, green, blue, and orange. then limit the colour pallete to them.
there are lots of places i am designing the need for red-green and blue into my ergonomics proposal (proposal for mirror X, Y, Z buttons in sculpt mode is one)
but great forms, and great colours so-far.