Free images results:

Veins pictures, stock photos and images


Leaf Detail Royalty Free Stock Photo
Author: Jgar
Leaf #4 Stock Photo
Author: Jnnfrws
Leaf #3 Stock Image
Author: Jnnfrws
Leaf Royalty Free Stock Photography
Author: Hkvam
Thorn Stock Photo
Author: Andykazie
Maple  leaf Royalty Free Stock Images
Author: Jk3291

Also, here are some commercial RF-licensed images that match your search criteria:  
Leg veins Royalty Free Stock Image
Author: Legger