different sets of notification icons based on notification bar color

Question

I am displaying a notification icon which is dark gray. It looks fine on Nexus One, where the notification area is light gray and is almost invisible on HTC Desire (Sense UI - dark gray notification bar). Is there a way to overcome that? (The icon cannot be changed).

Thanks a lot

EDIT: "The icon cannot be changed meaning" that I am using a custom set of icons which is a must for me.