This is a very simple project.
Every petal is formed by 12 beads with 28 gauge wire.
The number of beads determine the size. To get bigger flower, just add one or more beads for each petal.
Some people may think where the "wire" is? Thin wire used for beading instead of nylon thread. It costs a little bit more, yet it has the benefits of easy ending and capability of shaping. By the way, the color of wire will effect the looking of beads, since beads are more or less transparent.
When making small crafts, I always use left wires and materials from other bigger projects at first. This way will save some money, and the space will be less cluttered.