Creations with Gimp
Boy does it do a LOT for a completely FREE program. Of course it doesn't equal photoshop, but it still has some impressive firepower for those interested in image manipulation & graphics creation, but don't want to pay $1,000+ for the latest photoshop.
If you want to have a go -> Download Gimp & have a go with Gimp Tutorials. - just head to google to find even more.
I've tried out Abstract Wave Effect & Creating Liquid Fire - see the examples below: