Free images results:
 

Lettuce pictures, stock photos and images

 
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Hamster Stock Photos
Author: Prawny
Salata Stock Image
Author: Gogu
Salad Stock Photo
Author: Abdone
Tomatoes Stock Photography
Author: Chelnok
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Lettuce Royalty Free Stock Photography
Author: Twixx
Lettuce Stock Photo
Author: Twixx
Lettuce Royalty Free Stock Photos
Author: Twixx
Lettuce Stock Image
Author: Seanlean
Lettuce Stock Image
Author: Seanlean
Lettuce Royalty Free Stock Image
Author: Seanlean
Lettuce Stock Photography
Author: Seanlean