I posted a video a few posts ago about collars, and I do really love them! I find they can accent an outfit perfectly. There is such a variation of styles that can make any outfit from preppy to edgy. It's really the perfect piece to add to any ensemble.
Detached collars are great fun too! If you have any collared shirt, and you may not like the fit of it, just cut off the collar. Embellish it anyway you'd like and you can wear it with any shirt, sweater, or dress.