Take a photo, copy it, flip it, overlay it on top of the original.
Use this graffiti . . .

and get this.

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Tractor 1, take 1.

Tractor 1, take 2.

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Tractor 2, take 1.

Tractor 2, take 2.

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Sunflower and spider friend.

Double them up.

Really clever. It gives effects I would never have thought of.