For new possibilities check out some royalty free clip art. These might be more conducive for logos. And the pricing is pretty reasonable. Here's one I found that has some nice, simple, graphic yoga poses. Veer.
OriginalBlack & White versionBlack & White version - Chromed effectBlack & White with chromed effect - Most Light (masked)Black & White with chromed effect - Lighter (masked)Black & White with chromed effect - Darker (masked)Three colors2 colorsOne color - purpleOne color - greenPaint-it kubota action - BWPaint it EXTREME