Recently I watched a YouTube video which introduced "bokeh" painting to me. Sadly I have watched too many videos since then and don't know whose it was. I had never heard of it but I immediately loved it.
If I understand correctly, (which I hope, because this is how I did it) using watercolor paints you wet the 140-lb paper all over then drop blots of several colors all over it in random patterns to fill the whole card.
Once the painting is dry, using a white pigment ink pad, you daub ink onto increasingly smaller stencils of the same image. Since I had been cutting out hearts of multiple sizes for a Relief Society activity, I used the hearts.
These are what I came up with:
This is the yellow/blue/green group. Eventually I am going to make them into note cards but right now I am just trying out background colors.