I got the idea and a flower-stencil from a book a long time ago, I think maybe it was a Michael's Craft book.
I finally took the time and made it for my sister for Christmas.
Anyways, the flowers are hand stenciled then cut from velum paper from the craft store. Since it is a 50 light string I cut 100 flowers so that I could overlap different sizes/shapes/colors.
It took me many hours, but the completed project is beautiful. I wish I took better pictures before I gave them to her, but I finished them like two days before Christmas day.
Here is a close up with them turned on, sorry the quality isn't too good, doesn't do it justice.