Botanical Art at Filoli

I love botanical illustration and recently began taking classes towards a certificate in Botanical Art at Filoli.  Today was the first day of 'Drawing Plants in Perspective' and the above drawings were completed today with graphite pencils on bristol paper.

For our first assignment, we need to complete drawings of a branch and some sort of round botanical object (without perfect symmetry).  I am on the hunt for subjects and welcome suggestions!

And just for fun....a little Filoli trivia courtesy of Wikipedia:

The "exterior of Filoli [was] used as the Carrington Mansion on the TV series Dynasty."