Spoon frosting into small resealable food-storage plastic bag; partially seal bag. Cut small tip from one corner of bag. For each bunny, squeeze bag to pipe 2 small dabs for eyes, and place candy eyeballs. Press jelly bean in center of face, and pipe 3 small lines on either side for whiskers. Pipe lines for ears; sprinkle colored sugar on top. Repeat with remaining brownies (use photo as guide).