A star picture is a picture of a star, but if you are referring to what a pentacle is, it's an old symbol that is classified as sacred. Pythagorean's used this symbol to identify themselves and...
stars are just there. They don't make constilations. people base it on what it looks like.
A group of stars that suggests a pattern is a constellation, but the picture is strictly in the mind of the viewer.
Check the link for a new astronomy-related picture every day, plus archives going back a decade or so. Many of these make great desktops.
Possibly a constellation or an asterism.