I put that on my icon posts simply because I've had people take the textless icons, alter them minimally, and then figure that oh-so-cool blue filter they slapped on there means they shouldn't credit the work I'd put into it first. After that happened a number of times, I've just gone the route of "Textless icons are not bases, if you want any alterations made, I'd be more than happy to do it for you." :/