Start by putting a shallow layer of shaving cream in a dish you don't mind staining. I just use a disposable foil pan. And I HIGHLY recommend using unscented shaving cream because even the best smelling cream can get a little overwhelming as you work. Ask me how I know, LOL!
Add drops of ink on top of the cream. Use a spatula to create a design in the cream.
Use spatula to scrape away excess cream.
Cool right? Set cardstock aside to dry. Add more ink to cream, swirl and marble more paper!
To finish card, cut a triangle of colored cardstock (or ink one like me because I love doing it the hard way).