I wanted to be able to set the background color for the bars, here's what I did, sure there are better ways. But I'll leave that to the developers, just throwing out the idea and a patch file to make it work.
Usage would be as follows:
local bar = self.Bars:NewTimerBar(name, text, time, maxTime, icon, flashTrigger)
bar:SetBGColor(r, g, b, a)
Just some other notes that I've noticed. When the group is set to grow down, it draws the shortest timed timer on the bottom, but after that fades it resorts so the shortest timer is on the top.
I can't SetFill in the group, only in individual bars. Also, it's my opinion that a timer is a timer and should always count down the time, even if the bar is set to fill rather than empty.