Here is my DT example for Unstampabelles' challenge:
#115: September - Salutations and Greetings TWIST stencils in background
I've used a 12x12 stencil on another project. It was bolder on that paper. This is the negative that I have used. I used spray inks on the stencil, then pressed it against this white 12x12 paper and used my brayer to press the ink on to it. It is a subtle effect but I was happy for that for this project. I wanted all the focus to be in the middle on my son. That' where your eye goes instead of looking at the background.
I picked up the colours from the photograph to use.
I keep a small box with altered backgrounds for use in future projects. Saves waiting for ink or paint, etc to dry.
Using stencils is really fun. Have a go!