What you need:

Cocktail sticks/tooth picks
Card (two contrasting patterns/colours)
A button
Ribbon
glue
Tape 
Hole punch 
Scissors 

Step one: Cut the card into two circles ensuring one is larger than the other. Using the glue stick the smaller circle in the centre of the larger circle. 

Step two: Pierce two holes in the middle of the small circle once it is securly glued to the larger of the two using the hole punch. Once the hole is made use a needle or a cocktail stick to push the ribbon through both circles, from the back. Once both ends of the ribbon have been pushed through the holes made with the hole punch thread the ribbon through the button, one hole at a time. 

Note: If this becomes tricky try cutting your ribbon so it tapers at each end thus making it easier to thread.

Step three: Once the ribbon is in place secure it by tying a bow in the centre of the button and cupcake topper.

Step four: Now flip your cupcake topper over. On the back will be a 'loop' where the ribbon was pushed through. Carefully slot one end of the cocktail stick through that loop and apply a small amount of tape over it to secure it futher.

Now you have a very simple but elegant cupcake topper to adorn your baked goods!