Fold Nymphaea (waterlily) and variation from an octagon, a decagon or a dodecagon. It is a stylized representation of the flower sitting on a lily pad. Floral/foliage duo paper brings out the best in the design.
A Fujimoto-inspired poinsettia with leaves looks great in red-green duo paper, but you could use green paper with a white back to fold a rare white poinsettia.
Paula Versnick's beautiful Fern Leaf design from year 2000 definitely is worth a revisit. The leaf naturally takes a curved shape which gives it an organic look.