First of all take the glasses in which you want to serve.For decorate it, take a hershey syrup and squeeze in the glasses in any design and put these glasses in a fridge for 10 minutes.

Now take one jug and add milk coffee powder, cocoa powder, Hershey's syrup and sugar and add ice cubes in it.You can make this using mixer juicer also.I used blender and blend it nicely in a jug.Till we get foam on the top.