Brooch bouquets can be super expensive but there's no reason you can't make it yourself. I truly believe that given enough time and good instruction, anyone can make one.
I made a video How-To DIY tutorial that clearly illustrates how you can make your very own brooch bouquet. You'll see options for where and how to attach wire, using flowers for fillers, etc.
Also, I'm going to be giving away $200 of brooches. I'm sure that will come very handy!