I love this: The Internet's Guide to Identifying Famous Artist's Paintings.
Dappled light but no figures - it's Monet
Dappled light and happy party-time people - it's Renoir
Dappled light and unhappy party-time people - it's Manet
Another fun one: A tour of the British Isles in accents
And that's our art history and geography lesson of the day.