To be perfectly honest I'm not sure where the 'fairy bread' name for this one comes from - but it's colourful and easy to make, so it's bound to appeal to young children.
You will need:
Butter (or margarine or what ever spread you want)
Hundreds and thousands
Butter the bread, then sprinkle hundreds and thousands on the bread. Cut out shapes with the cookie cutters.
For a variation you could try different spreads - Nuttella for a dark (and tasty) background colour or perhaps honey for a stickier surface (and stickier fingers).
Consume at your leisure! :-)