Rainbow Volume Knob
I don’t think the rainbow colors properly indicate volume increase/decrease, though. Might want to modify it a bit.
Rainbow Volume Knob is a free UI design resource made by Dribbble user Zan. As far as I can tell, its license is Unknown.
Helpful hint: Dribbble users are nice. If the license is unknown, it is usually because they forgot to mention it explicitly; not because they were being stingy. Ask nicely and they will probably allow you to use it.
