Pixelogic has a unique spin on 3d modeling. Specifically, they are in the camp of Curious Labs' Poser product, where pixel intensity is used to define polygon size and placement. This is not a new concept; John Knoll (Photoshop's daddy designer) has a now free product called CyberMesh that'll crank out a DXF "landscape" from pixel brighnesses in an image, and Alvy (PIXAR) Smith has often discussed the relationship between bitmaps and vectors in computer art at SIGGRAPH.
Thought you might like to take a look at "painted" 3D art. It's a little steep: $700U.S., but a worthy entry point for someone with no interest in pushing polygons around a screen!
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