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For skies/ trees and seasons.. there is a book called "Sky Tree"
that my husband and I use for science/art.
Sky tree : seeing science through art / Thomas Locker with Candace
Christiansen. Author : Locker, Thomas, 1937- Call Number : 582.16 LOC Publisher : New York, NY] : HarperCollins,  Subject Heading(s) : Trees--Juvenile literature. Seasons--Juvenile literature. Trees. Seasons. ISBN : 006024884X (lib. bdg.) : $15.95
I have been following the discussion about white skies... I thought
that it was just easier for them to color a little cloud than a large
area... what I do:
start with colored paper,take them outside,
show examples of really different skies - yellow etc...
(author/illustrator Byron Barton is one I use with the little kids)
but I must say that I was so proud of my own 6 year old... He drew a
picture of an angel for someone, and showed me when he was finished... he
announced that he left the cloud she was in, and the cloud she was on white
and colored the sky blue... must have been osmosis...