From Guild Wars 2 Wiki
- Healing skills are various shades of blue, regardless of profession.
- Downed skills and drowning skills are black and red, regardless of profession.
- Guardian skills are blue and white.
- Warrior skills are yellow and orange.
- Engineer skills are grey and rust-colored.
- Ranger skills are yellow and light green.
- Thief skills are gray and magenta.
- Elementalist skills are red and blue, and some skills use the attunement palettes.
- Mesmer skills are purple and magenta.
- Necromancer skills are dark green and black.