A technique I enjoy is 'Direct To Rubber Watercoloring.' It's simple, cool looking, and fashionable unpredictable. Just ink up and then paint with water following the direction of the image. If you are wanting a crisp image this is not the technique for your project. If you want whimsical and blended try it out.
I have used the So Very Happy stamp set and a palette of Hello Honey, Tangelo Twist, and Strawberry Slush Stampin' Write Markers. The "happy" greeting was cut forma piece of Sahara Sand card stock and then paint washed with Night of Navy ink.