Smoke Art. This rose is an actual image of smoke - the only change is the colour added by Photoshop.
Going Up In Smoke by Ashley Mackenzie illustration
smoke bird - Birds Wallpaper ID 1106648 - Desktop Nexus Animals
SmokeWorks Set at Mehmet Ozgur Applied Arts - Award winning, smoke art, landscape photography, Smokeworks
Ballerina made from cigarette smoke. I hate that it's cigarette smoke, but the smoke part is just awesome
Alex Nero photographs paint inside of a water tank to achieve this crazy effect.