|I don't know who to credit on this photo, please drop me a line if you do!|
To get the right consistency for the chocolate you need to temper it. If you have no clue what that means, check steps 2 to 5 of Dark Chocolate and Coconut Bonbons post. Bare in mind it is simpler to do than it seems when you first read it.
The rest is pretty simple. Choose your glass (sweet cocktails might go really well with it), dip it into the chocolate then on a cup filled with hundreds & thousands. Leave it to dry. Again, for cocktails my tip is to take the glasses to the fridge, if you have enough room for it of course.
Note that for kids parties it is always worth to advise the little ones not to try to eat the glass. I'm sure they will be pretty tempted.