YOU WILL NEED.
A Sandwich Bag.
A Yogurt (preferably without chunks)
|Take as much Yogurt as you want and pour it into the sandwich bag.|
|SNIP a tiny bit out of the corner.|
Oh and at some point put the grease paper over the baking tray.
|Your sandwich bag should now be a fully functioning piping thing.|
Anyway, this is the fun bit, it doesn't matter what size or shape they are, so just have fun with it and do lots of things which resemble dots in some way.