It is harder to find Canadian Flag fabric than US Flag fabric. Generally it is only found in the Canadian equivalent of Joannes (FabricLand) prior to Canada Day.
There are lots of Maple Leaf block patterns and appliques.
http://www.patricklose.com/shop/Mach...maple-leaf.htm Patrick Lose design
http://www.patricklose.com/shop/Mach.../Oh-Canada.htm
Another Patrick Lose design for Maple leaves.