What I did first was real simple: I used the Threshold effect on a photo, tuning it to show just enough black to make out the guy and the tree. What I did next was not so simple: I used Photoshop to generate Halftones of popular, but not a lot of halftoned colors. I brought the separations (halftones causally have four C,M, Y, and K plates) auto-traced them, and then carefully nudged a row here and there so after adding colors to each "plate" the resulting halftone was seamless.
Then I clipped my halftone vector samples to the appropriate areas in the drawing.
As you can see here, the halftone color samples aren't perfect. When I get a little time, I'll nail them as seamless tiles and offer them in the ClipArt forum.
-g
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