I'll just document some of the other cooldown methods that you might be interested in here.
Lua Code:
-- Hides flash animation (bling) at the end of the cooldown
Cooldown:SetDrawBling(false)
-- Hides background (swipe texture) of the cooldown
Cooldown:SetDrawSwipe(false)
-- Hides the glowing line that marks the edge of the cooldown swipe
Cooldown:SetDrawEdge(false)
-- Hides the countdown numbers regardless of the cvar setting
Cooldown:SetHideCountdownNumbers(true)