1st I purchased the mini lego guy ice tray from http://www.lego.com/ and colored chocolate disk. Fill each section with desired color of chocolate. I found the baggies with a small snip in the corner worked really well. Pop them in freezed for 5-10 minutes.
When they are finished push out of tray.
Then I used black food coloring and a toothpick to draw on the face. Let dry.