I really love your work. I would like to know what you use to make these, too. Embroidery floss or yarn?
Also, I stumbled upon this book on amazon the other day after seeing your work and wondered if you have any knowledge of it? I would love to have some flower crochet patterns: http://www.amazon.com/100-Flowers-Knit-Crochet-Embellishing/dp/0312538340/ref=sr_1_1?ie=UTF8&s=books&qid=1239997483&sr=8-1
For the orchids I like them the size shown but i think it would charming to do them smaller with a few more on a necklace. Do both! That's one of the lovely things about orchids, they come in so many sizes and colors! I am partial to these green and burgundy types that have kind of a gourd shape.
Suggestion: Weeping hearts. I love these flowers and i think they would be a great necklace flower if you could figure out how to make them! I think my favorite is the fuschias. Thanks so much for sharing your work! you have inspired many of us.