Wow, such great ideas - like the cottonball and the collar bone idea. Never heard of those before, but they make sense to me.
Chris, back in the late 80s when brooches were very much in style I collected vintage brooches and always sported one on my blazer. I haven't worn them in years but I've been having so much fun bringing them out again after all this time.
I would say as long as they aren't cutesy - like holiday themed! - go for it, experiment, play! Jeweled brooches in particular can look amazing right now. What's cool now is wearing multiple brooches - ones that harmonize in some way, whether it's motif or color of the gems or color of the hardware - so try that too.
For example, here I am wearing two vintage brooches together - these two happen to be hand-me-down costume pieces from my mother, who got them from my great-grandmother:
http://s386.photobucket.com/al.....ooches.jpg
I have to say, I like the brooches I have had for years more than the brooches I see in the stores now. That includes Jcrew, BR and AT. BUT, that may be because I'm so darn petite: it seems the brooches for sale now are HUGE in scale, too huge for my petite frame.
One idea not listed here: take a smaller brooch and wear it as a button, for blouses that are too low-cut. I have an onyx brooch that is only about one inch in length that I wear to button up a white blouse that has black buttons. (oops, I thought I had a pic of this, but I don't... I've done this a few times ...I will have to take a pic!)