Alcohol inks! In case you don't know what they are.....they are inks or paints with an alcohol base. Unlike oil paints or watercolor paints. These inks are thinned and use with Isopropyl alcohol, at least 91% alcohol. There are many, many videos on Youtube, so if you like what you see, go check them out and maybe you'll be hooked, like me.
You need alcohol inks, of course, which you can buy at Michaels or Amazon or any art or craft store. You also need a special paper, such as Yupo (expensive) or the wrong side of glossy photo paper. You will need the alcohol mentioned above to push your inks around.
You also need an air source to push the inks around on your paper, such as a straw, canned air, a bulb puffer, a hair dryer or an air compressor (my favorite)
I will not go into detail, but if you are interested, just go to Youtube and search for alcohol ink techniques or painting and you will get enough to keep you very busy.
Now to show you just a few of what I have done. The first several were done by using a hairdryer (preferably one with a brush that you can remove). Mine is a Revlon, which many demonstrators use.
These were all done on 4 x 6 or 5 x 7 paper, perfect to use on my cards,