1. Take any graphic you want; the simpler, the better.
2. Go to the Layers tab, right click, and choose Duplicate Layer
(You'll get a message asking what you want to name the layer and where you want it. Just press OK to go with the default.)
3. Go to the Image Section in the top area, select Adjustments, then Desaturate.
4. Now, here's what my graphic looks like so far:
GOOD LUCK !! :)