I don't know if this is the right place for what I'm posting, but I figure, it does say "UI" and design discussions, so I figured I'd post this here.
So, I recently reached out to Wheels who made the awesome GCD BAR addon.
I talked to them a bit and they were able to make it so that it was not a countdown timer, but a count-up timer to when the next skill could be used.
As I was using it, though, I couldn't find a great place to put it that would let me use it without my directly staring at it. So, I thought to myself "what's the best way I could make this work?"
I said to myself "if I have it change color when it's ready, then even if it's just in the corner of my eye, I'll see it and know I'm good to go.
So I decided to go one step further and make a mockup of a cursor addon that would be a color-changing count-up timer for the GCD. Segments would fill in as the cooldown progressed, and then it would change colors when it was "full."
I mocked up the below. Let me know what you think!