Here ya go, everything I know about making button flowers - enjoy!
To make a button flower, you'll need 5-6 smallish matching buttons, a larger button for the center, and if desired, a small button for the center of the big button.
The key to making these is the glue. The three pictured above are some that I've used with success. What did NOT work was hot glue, craft glue, and E6000. Make sure the glue you use is meant for beads, glass, & plastics.
Make a ring out of your matching smaller buttons. Make sure the flattest side is facing up, this makes a better surface for adhering. Place a small dab of glue on each button.
Place the center button on top - flat side against flat side. **You can make the flowers with the ridge side up on the bottom layer, but it holds better with the flat side up - it's your call.
Next, put a small dab of glue in the center, then place the small center button. Let glue cure for 24 hours.
If you want to make this into a brooch, you'll need a pin-back and a small circle of felt.
Glue the pin-back onto the back of the button flower.
To make things neat & tidy, glue the felt circle on top of the pin-back. Once your glue is dry, your button flower is ready to use. That's it!
Use your imagination to come up with all sorts of combinations!