This is what a bright foreground star looks like in an image from Galaxy Zoo. As it is in our own galaxy, and therefore much closer than the distant galaxy cluster in the image, it appears far brighter and essentially spoils the rest of the image. Though sometimes it does look rather spectacular. Especially in this image, where the different filters used result in the red, green and blue appearance.
Search through more spectacular images like this at www.galaxyzoo.org
Daily Zooniverse 
What I find especially powerful about images like this is the perfection of the colored rings around the bright star (Airy rings), and the color patterns in the ‘compass points’ (technically, diffraction spikes) … they show just how excellent the optics of the Hubble Space Telescope are! Even better, one of the galaxy’s nuclei also has Airy rings!! A visual indication that it is an AGN?
What I find especially powerful about images like this is the perfection of the colored rings around the bright star (Airy rings), and the color patterns in the ‘compass points’ (technically, diffraction spikes) … they show just how excellent the optics of the Hubble Space Telescope are! Even better, one of the galaxy’s nuclei also has Airy rings!! A visual indication that it is an AGN?