Sun coming through cypress trees at Caddo Lake, in far east Texas.  Shot with a very wide angle lens looking straight up.  If you want the sunlight to break up into the little sunbeams, you have to close down your aperture nice and small – here f/16.

Bald Cypress Trees

Canon 1Ds MK III.  16mm.  ISO 200.  f/16 @ 1/8 second.