I get video loops and graphics from several places:

• If you want something more artsy and gritty: http://twotp.com
• http://churchmediadrop.com/ has a few things.
• http:/canva.com is good for creating custom graphics for social media or event flyers.
• For stills and message series graphics I use http://gracewaymedia.com
• http://unsplash.com is a great site for royalty free photography.

What are your favorite sites for graphics and videos?