Free images results:

Picnic pictures, stock photos and images


Sign Royalty Free Stock Photo
Author: Csrobles
BBQ time Royalty Free Stock Image
Author: Dkgilbey
Tomato Stock Image
Author: Suti
Onions Stock Image
Author: Suti
Benches Stock Images
Author: Abdone

Also, here are some commercial RF-licensed images that match your search criteria:  
Picnic Stock Photo
Author: Yuraf