I made some nice, large backgrounds to fit the Elements Playing Card, but even snippets of these will make good background images for smaller projects.
I mainly chose images (for the 3 large background images) that had a lot going on in the vintage star maps (but if you're going for deeper meaning — or you're a star-gazer — they show the constellations of Leo, Taurus and Aquarius).
And the top row are all broader images of the sun and planets.
This collage sheet is also included in the Cards & Constellations Kit; see all the other kit components.
Design Team Member Rhonda Secrist Thomas made It's in the Cards (see the wide photo below). More info in the blog and/or see the supply list.