Looks good, only things i would fix is the tooltip position & the buff/debuff? timers in the middle to a bigger font like the one you use for the unitframes, maybe only use minutes. just my own thoughts tho :D
I've been wondering about this and these screenshots inspired me ;) Is it possible to make the spark 1 px wide and solid black?
Whatever the addon is, my spark seems to be too tall for the frame and the width not clearly defined, and the height issue especially is something I was wanting to fix too. What needs to be modified if there's an addon that uses the spark?
I imagine the problem can be that the movement makes the 1 px spark look fuzzy, but at least your spark isn't taller than the frame. :)