First you will need:
Some kind of circle template
Heavy duty thread (I use light weight fishing line)
Glue gun (or your glue of choice)
Some kind of button or jewelry piece for center
Lets get started:
The first thing to do is cut out 5 or 6 fabric circles (it works for a 5 petal or a 6 petal flower...your choice). There is no specific size so just keep in mind your finished flower will be approximately the same size as the circles you cut. I used a ribbon spool for my circle template.
Next take one circle and fold in half with right side of fabric on the outside.
Then fold in half again.
Now thread up your needle. Make sure you use some really tough thread because you will need to tug on it really hard without breaking. That's why I use the fishing line.
Run a gathering stitch along the raw edge (the rounded part) making sure you catch all the layers.
Hint: Make sure that you start and stop your stitches with the fabric edges both the same way on the needle (does that make sense?) (maybe the pic will help...either both corners up or both corners down on the needle)
Slide it partway down on the thread. Repeat with all of your circles and you should have something that looks like this:
Now take the ends of your thread and tie them together and pull hard until the flower is really tightly closed. Then tie the thread 3 or 4 more times to make a really secure knot and trim threads off.
Now either glue or sew your center on and you are done. You can use a covered button in matching or contrasting fabric, use a regular button, use an earring or just about anything you have on hand to make the center. That's it kids. Wasn't that about the easiest and great looking flower embellishment you have seen?
I used the same technique to make "leaves" for the fabric rose in the first picture too. Maybe try layering a smaller set made with lace on it before adding the center. The possibilities are endless.
If you have any questions on this tutorial just comment and I will try to answer.
If you don't want to make your own, you can buy some of these in my etsy shop