Using 2d tree and people images in Flamingo to render perspective

[Kaner65]

Hello, I was wondering if anyone has ever tried to render 2d trees, plants or people in Flamingo instead of using 3d objects. I've seen it done in Sketchup and it looks pretty good. I've tried in flamingo but am doing something wrong the images look grainy and pixelated and when I use 3d objects in rhino it slows the render time considerably. If anyone knows how to do this in any program, the info would be greatly appreciated.

thanks,:)