Robin_Usagani
TPF Noob!
Here is one I just did with 5D3.
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The 1D X and 5D III can do in-camera multiple exposures. See: Canon EOS 5D Mark III - Tutorial Multiple Exposure Shooting 13/14 - YouTube
My 5D II did not do in-camera multiple exposures... and I'm not aware of any prior body that did them.
My brain is being slow in working this out still - but if I get it right the couple is the shot taken first and presents the pure white background with the characters black against it. Then the second shot is imposed over the first, where upon the darker middle exposure is written over by the latter, which only partly writes over it in the whites; causing the remaining blacks from the first image to take on the form of the branches.
I think there's a difference between "multiple exposure" and "image overlay"...these are not the same thing. Robin's admittedly interesting trees + people is not a multiple exposure, but an image overlay effect.
You can use multiple exposures using strobes. I think 5D III can do on camera double exposure.