How do I change IKImageBrowserView's selection highlight color

When you select an item in IKImageBrowserView it is highlighted grey around the edges. How do I change the color of this?

So I was able to achive what I was looking for by going the complex route that combinatorial suggested (Thanks!). I implemented the custom IKImageBrowserView and IKImageBrowserCell classes from the sample project here: http://developer.apple.com/library/mac/#/legacy/mac/library/samplecode/ImageKitDemo/Introduction/Intro.html

Too bad there isn't an easier way to do this but this will do the trick for now.