In a follow up email on one of the groups I belong to, I found this addition to the nail polish technique---thought I would add this for some options.
This technique is similar to using liquid oil paints to get a patterned surface on cardstock.I simply use luke warm water, drop a few drops of liquid oil paint onto the surface of the water, it can all be one color, or one color inside the other to get a different effect. Then simply lay your piece of cardstock on the surface for only a couple of seconds, pull straight up to remove and turn over immediately, let air dry. I have used this technique for years with children's craft classes.
4 years later...
4 months ago