I recently bought a few postcard off eBay (am cautious of repeating that experience as I have found the postcards there to be overpriced . . . ), and the seller, who is Canadian, sent them in a mailer with these lovely stamps.
The stamp on the left is in honor of the Lunar New Year 2011, Year of the Rabbit. I couldn't find the stamps on the right, but they might be part of their Beneficial Insects series as they are very similar in design.
I've gotten very few postcards from any Canadian Postcrossers (or postcard swappers), but maybe I'll eventually get one comemorating the anniversary of the Titanic (though then again maybe not as those are domestic stamps).
They're quite nice and somehow even managed to miss the cancelation mark, which means you can actually see the picture on the stamp!
To see more Sunday stamps check out Viridian's Postcard Blog and follow the links.