There are cases where the blue flashes really do not fit the colour scheme of the background. In order to adjust this, being able to change the colour of the flashes would rock. I suggest an option in skin.ini or a scroll bar in video options.
edit:
Zarerion wrote:
Additional idea: How about letting the color change constantly?
Like, setting 2 or more colours and the visualizer will keep changing between those colours in a customized order?