I've been playing around with a fun technique that makes gorgeous backgrounds.
The technique is pretty simple. Cut a gallon or quart sized freezer bag on two edges so that it opens up all the way. Select 2-5 markers that will look good together. Scribble on one open side of your plastic bag. If you have colors that don't blend well, make sure they're separated by colors that work well with both of them. For the record, orange and blue make brown. As you can see, I separated the Pool Party and Tangerine Tango with Summer Starfruit or Rose Red.
Spritz the plastic bag with rubbing alcohol so that the ink starts running. The Stampin' Spritzers work perfectly for this. Yes, you could use water, but alcohol dries faster.
Put a piece of white or vanilla cardstock in the ink and press down. Pull it up and take a look. If there are blank spaces, put the cardstock down in some of the ink that remains.
Let dry and then stamp with outline images using Staz On, or solid images in coordinating colors. For the card above, I stamped the Pleasant Poppies background stamp and then colored it in with markers.
Hopefully this makes sense for now. If you have questions, leave me a comment. I'll try and take pictures soon an post a better tutorial.