Take one piece of white card and cover it in distress inks. I chose picked raspberry and evergreen bough as they are Christmas colours. Where they overlap and blend it makes a nice purple shade. Spritz the background with water.
Then layer white paint on top through various sized circle stencils, layering them up and overlapping the circles until you achieve the look you want. I made my stencils using punches and a scrap of Kraft card. I also substituted the acrylic paint for ColorBox Mix'd Media ink which is more of a paint than an ink.
The finished panel is the one bottom right in the picture :
The panel on the left was the same technique but using distress stain instead of ink which I don't think works very well, it would take a lot of paint layering to knock those colours back. The small panel at the top of the photo is just left over ink spritzed with water and card smooched through it. This one was used to stamp the Merry Christmas sentiment (Kaisercraft Christmas Carol set).
This is the finished card with black dots added around the border:
Thanks go to the Craft Barn demonstrator for the inspiration.