I modified the original one you had given me.  I put grey behind the blue layer on top which gave the brain a grey color before I removed the white background.  Although sheep brains are white in color and I guess human brains are probably the same color, I just like the grey colored brain.  Maybe white brains would be better for the user navigation bar though but I'll keep the grey with blue one for the left hand corner.  I want to get rid of the pinky brain color from the favorite icon.