...alcohol is a fabulous resist.
You can find a written tutorial on it here, and if you prefer a video demo, there's a new one on my YouTube channel:
I love the way that the dropped alcohol (use a mask please!) looks over the spray-misted alcohol.
These backgrounds lend themselves easily to journal pages or paintings, as you can see in this progress photo.
It's a fun technique and I encourage you to give it a go! Just remember to use full-strength (non-drinkable) alcohol, and keep it away from your mouth!