Will colored shredded coconut show up in brownies?
Thanks rumtscho.  I wasn't sure if I should post as an answer or an edit.  I've edited to remove answer and place here.

Update: I ended up making two brownies. 
One 8X8 pan with 6 bags of mint tea stirred into it. It gave off a very earthy (and minty) smell and has a very earthy/herby taste (and minty too).  I doubt I'll make the mint ones again. 
The second one was a 9X13 pan with 2/3 of a bag of shredded coconut colored green. I put the coconut in a bowl and used gel food coloring.  I don't have a huge selection of colors, so I used green with a touch of brown. I could have used a little more brown so the green wasn't so bright. I mixed it in the coconut and then mixed most of it into the batter. The remainder went on top and lightly swirled into the batter. The effect was really good and amazingly the color didn't seep into the brownies. When you bite into them, the coconut maintained its green color. I didn't have any white chocolate to try the green white chocolate idea, but maybe next time. :)