I has the cardboard circle sitting on my work surface from a roll of wire and knew it would turn into something, so the moon seemed to be the obvious thing. I created a stencil and stenciled on the geese but could decide which background to go with.
I think I will end up going with this background but tried the others below. The simple black gesso, with silver splatter and Posca pen stars, is probably the most effective. Maybe someone will let me know what they think.
I had a couple of existing backgrounds I thought I would try. My first was this one, but I think it's too busy.
So next I tried this one - which would need some more work if I used it.