On Season of Discovery, mages have two Spell Alerts that share the same texture:

• Arcane Blast, from phase 1
• Missile Barrage, from phase 2

The base texture is purple. To avoid confusion, Missile Barrage was given a blue-ish tint.

At least, an option should allow mages to let them select which one will be purple and which one will be blue.

Another possibility to is to generalize the option to let players select their own tint from a color wheel. While this options sounds nice from a customization standpoint, it has many drawbacks in terms of development, compatibility, and of course user experience.