if they don't look right, you will be able to bring them back, won't you?

because then i'd do the white ones and get ivory fabric paint at Michael's.

Folk Art Fabric Paint doesn't come in ivory or cream, but you can get the regular acrylic paint and mix it with Textile Medium. make sure you wet the lampshades first and let them dry to get the sizing off, then brush on thin layers of your paint until you get the right colour.
My blog:

http://labellatestarossa.blogspot.ca/

Little Mother of all the Roaches, President-for-Life of the MAC Harlots!