Here's another standby for the group Halloween costume set. This band’s popularity may wax and wane, but the group never really goes out of style.
Finding these costumes can be more problematic, but at a minimum you can get away with doing the face paint and finding some big, puffy wigs.
Of course, if you’re going to be the Gene Simmons character, you might want to think about how long your tongue is when you stick it out of your mouth. (Gross, we know, but it's a signature detail of the KISS look.)