You're thinking about this wrong. You can't force yourself to see the color change. Even in Spaz's post, it doesn't really look like that (at least the Blue/Black thing). (EDIT: NVM, that last picture in that article shows it perfectly, at least to my eyes)
It's something to do with your eyes. When the color changed for me/Bee the first time it was just me refreshing my browser. You can't force yourself to see it no matter what you do. :P
It doesn't make sense until you see both versions of it with your own eyes, because it's very obvious what the difference is when it happens. Now if I only understood why, I'd like to see the Blue/Black again.