So my latest obsession is the Liquitex Pouring Medium.
What you do pour the medium in the middle of a canvas, add your liquid colorants, use a stick to create the marbling effect, then tilt the canvas to create cool effects.
Here's one I did with Ranger Patina paints.
Here's one I did with alcohol inks.
P/s: Happy weekend friends! If you have time, come play along with LESSology Challenge #51: It's reading time!.