Re: Why so Sirius?
Not to be that guy but the stars in this design look taken from the images on http://powerpetsmania.com/ppm/profile.php?guide=backgrounds. I don't think it's allowed to pass anothers work off as your own but I leave to the woot staff to say (image below).
Also the clouds behind the dog looks like a photo of a nebula, but I can't find the photo so it's hard to say. Don't want to make accusations that cannot be proven.