I was mucking around with changing the icons for different things, and found that for the different Session types there is only the blue icon. It would be really good to have the icons available in different colors so as to easily be able to distinguish between different environment at a glance.
It's funny because I was about to answer you. It's just hard todo. We will need to create all the images in all the different colors. We already have to do that in 16x16, 32x32, 64x64.
Perhaps we could do that as an extension.