The first Picture is a Flower. The picture came from a set of 25 which were all different angles and view points of the flower.  I started with a full color image and changed it to gray scale.  Made the contrast greater and the clarity as well. Added darkness to draw your attention to the flower's tecture.

The second picture is of a wheel.  The wheel is part of a lounge chair.  The original picture consisted of a tan colored metal lounge on a red stained wooded deck.  I removed the color and made the details of the wood and the wheel stand out.

The third picture is of a pile of rocks.  The rocks are naturally layered on one another with bits of soil and grass peaking through.  The original color scheme was a gray neutral scheme including the soil and grass. I made the tecture of the stone stand out and tried to darken the back ground  area so that the main focus was the stone and its tecture.