I know that there are about a bazillion flower tutorials out there, but I thought I'd share my way of making them. It's really quite simple.
Start out with about a 4" square of fabric - this will make one petal cluster for a flower of approximately the same size. You will need about 6-8 of these squares. For this particular flower I used 7 squares.
Fold in half.
Fold in half again, matching short sides.
Next, cut out an ice cream cone shape, with the folded corner of your square as the point of your cone. I used pinking shears, but this isn't necessary.
When you open it up it should look something like this:
Next, sew a circle around the center, just a simple running stitch.
Pull threads together, like a little drawstring, tie the two ends of the thread into a knot, then cut off the strings. It should look something like the photo below. I've learned that the bigger the circle, the more gathered the petal clusters become.
Repeat these steps for 6-8 petal clusters. The more petal clusters, the fluffier the flower.
Once you get them all gathered, string them on some thread. I like to use a double strand for strength.
Pull the thread together, like you did for each petal cluster. Tie in a knot and cut thread. At this point your flower should look like this:
Hot glue the felt onto the back of the flower, or you can sew the flower onto your project.
To finish, sew (or hot glue) a button to the front. Voila! A fluffy flower brooch.
I hope that was clear. If you have any questions, feel free to ask!