Flags of the World tree - great idea for kindergarten display, nationalities of children/teachers with photos, dress, food etc.
Styled Stock Photo Frame Mock Up Product Mock Up Empty
A personal favorite from my Etsy shop https://www.etsy.com/listing/534706629/frame-mock-up-styled-stock-photo-product
stock xchange - another great website for free stock photography. You do have to maneuver around the pay photos, however.
ISRAELI ARTILLERY POSTION GOLAN HEIGHTS EXCHANGE FIRE WITH SYRIAN
Skyscrapers Close together Windows Marquee. - Stock Photo | by downundershooter
One of many great free stock photos on http://www.pexels.com
The Leading Source Of Free Stock Photos - freeimages