One of the fun things about ATC/ACEO's is that they can be made with just about any medium you want to use. Paint(acrylic or watercolor), mixed media are two of my most chosen to work with. I'm just a newbie without much talent but like to make the effort to see the results.
This is my version of the little boat my dear hubby designed and made a few years ago. It is his baby and doesn't trust any with it but himself. We have enjoy many outings with it since he made it.