Free images results:

Stamen pictures, stock photos and images


Camomile 1 Stock Images
Author: Lleha
The Fly Royalty Free Stock Photography
Author: Marilyna
Flower Royalty Free Stock Image
Author: Jolin
Bee Royalty Free Stock Photos
Author: Mhd
Bee Royalty Free Stock Photography
Author: Mhd
Parachutes Stock Photo
Author: Tonyd
Sunflower Royalty Free Stock Photos
Author: Red2000
Elegance Stock Images
Author: Mlevy
Tulip 1 Royalty Free Stock Photos
Author: Lleha
Bud of violet Stock Image
Author: Ivz
Red kalanchoe Royalty Free Stock Photo
Author: Ivz

Also, here are some commercial RF-licensed images that match your search criteria:  
Stamen Stock Image
Author: Fremme
Stamen Stock Photography
Author: Hlavkom

Explore more commercial options: More Stamen Stock Illustrations & Vectors | More Stamen Stock Video Footage