You firstly need to get 4/5 small buttons and place them in a circle
Then you want to place small dabs of glue on the inside of each button
Stck a bigger button in the middle
Now this is the basic thing and you can work on making them really high with different colours, stick little gems in the middle etc
Now once your button statue has been finished and dried (for the bigger buttons I tend to use hot glue) you need to stick your hairclip/brooch on. Again I use hot glue. Make sure the clip is fimly stuck on. I normally go around the edges to make sure it has been stuck on propperly!
Now you need to get some felt and cut it to size. Now stick it on the back and wear your hairclip with PRIDE and go and show your nans what you have done with there old button collection :D