LAC images on Flickr

Since 2008 Library and Archives Canada has been adding photos to a collection on Flickr. There are now 4,343 photos in 147 categories. Here's the direct link to the LAC collection.The most viewed are:

Collection	Views
Opening of the New Nitrate Film Preservation Facility	8,332
The Shamrock and the Maple Leaf	7,650
Sir John A Macdonald	6,100
Canada and the Second World War	6,014
Halifax Explosion 1917	5,797
Grosse Île	4,746
Prime Minister Alexander Mackenzie	3,926
Vimy Ridge April 9, 1917	3,865
Prime Minister William Lyon Mackenzie King	3,617
Kodachrome colour images of D-Day and Normandy	3,606
Canadian Women and the Peace Movement	3,450
D-Day	3,192
Trans-Canada Highway	3,028

This is a source for royalty free images so go ahead and use to illustrate your family history, but do credit the source.

Explore Flickr for many other sources, Canadian and otherwise, for creative commons licensed and no-cost images. For instance, the National Library of New Zealand just added 4,304 photos to The Commons.