Free Bible images is a web site offering free sets of Bible story images for teaching use in PowerPoint, pdf, keynote or jpeg formats. Anyone can download sets of Bible story images anywhere at any time - absolutely free - www.freebibleimages.org
(Note: I just used a set from them (Elijah praying for rain) for my chapel message. Very handy!)
Bible Picture Gallery
This page has many Bible pictures that you can download freely.
E Bible Teacher
This page has free images you can use in your Sunday School and sermon materials.
(Note: Some of the side ads seemed to inappropriate for this site. Just be observant!)