Below, there are images from series "Birds and impossible objects". Shapes of impossible figures by Oscar Reutersvärd were used for these artworks.
Artist's personal blog http://zimmer404.tumblr.com.
Artist's Behance Network profile http://www.behance.net/MonaRing.
Click on thumbnail to see image in better quality.
Images were found at http://www.behance.net/gallery/BIRDSANDIMPOSSIBLEOBJECTS/1126583.