Reminds me of the X-Box power button
the circle with a line through it is the symbol for almost all power buttons.
If you want, I have a very good button I made, you could put a power symbol on it for v2.
here:
It is trans, and the button itself is slightly trans, so it will be tinted the color of the brick. Made it in photoshop.
I know that it is not the right size, but you could always crop it to size.
