White seems an important color for me, in the garden, as it seems to make every other color come alive. However, on some shrubs, as the blooms age, they ten to brown a bit and that can look 'dirty'. I stay away from white crepe myrtles for just this reason.
The one color I will pass up if I am buying plants is the 'bright pumpkin orange'. I do grow lilies and milkweed in that color but they are not a favorite. Since I have the space to grow my favorites I allow those that are not my favorite colors to grow and bloom in the garden.
I do agree that some foliage that is brown or rust can make a plant look like it is dying.
Experimenting with color up close and from a distance is a good idea.
As far as cool pinks and warm pinks...... two definitely different colors and when planted together one will make the other look really sad, old and/or faded.
Just my garden thoughts and I love to tour gardens that are completely different than mine. It is grand that there are as many different gardens as there are gardeners.
