The trillium is nearly identical to the monja blanca, the only difference being that two monja blancas are combined to produce the trillium.
This fold is particularly effective when two different colors are used.
The monja blanca (old white nun) is the national flower of Guatemala. (I have taken liberties with the coloration.) It requires a triangular starting shape, which may either be printed and cut out from the instructional sheet below, or folded and cut using the triangle base.
My 8 March 2013 blog about origami prompted me to launch a second blog, one dedicated solely to origami. This way, as I complete instructional sheets, I can post them directly to this blog and it will not interfere with my Beatles blog.