Images for Free

With the seventh commandment telling us not to steal, I'm always surprised to find churches paying for rights to use music, but using whatever image they like and happen to find in a Google search, without bothering to purchase it, or at the very least, give the original artist a line for credit. So with that in mind, there are a ton of places with free imagery, but these are the sources I usually go to find quality images that one can freely use; some have licenses that don't require giving the artist credit, but most do; small price to pay for free use of quality imagery.