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It becomes very funny when you Make a checkerboard like this with simple black and white. Then copy it to the clipboard.

Now open a photograph of the same size (or resize in PS), and then a second one. With the move tool drag the second photograph on the first one. see that they are adjusted.

Now press the second icon from the left at the bottom of the layers palette to add a layer mask. Alt-click on the mask icon to show the (now white) mask.  Now just Ctrl+V to paste your checkerboard on the mask, re-activate the normal layers (click on the icon) and whooshhh: you have a checkerboard of two photographs...

Ahhh...and suppose you have made black squares on your layers, and you want to change their colour: just lock transparancy in the layers palette, and you gan paint and doodle with the balck without affecting the transparant other squares.

etc etc etc...