As part of the Grand Depart challenge we created edible bike pictures on paper plates using biscuits, sweets and icing with a prize for the best one.
Digestive Biscuits / Jammy Dodgers or similar
Chocolate buttons and other miscellaneous sweets.
Healthy alternative would be to use fruit instead.
Each child gets a paper plate and a selection of sweets/fruit to use. A picture of a simple bike is left on each lodge table - and off they go! The challenge is actually having anything left on the plate before you get to judge them :)