Thanks for posting! Vintage peacock feathers! Those sound so beautiful and unique!
If you want to DIY with them, a project that comes to mind is the Minimalist Dreamcatcher I made. I originally made them with black feathers, but I think some peacock feathers mixed in, or a larger one with all peacock feathers could be so cool!
As far as displaying them, I’ve seen beautiful feathers arranged in a vase like flowers before and it is very chic and timeless. Since these feathers mean a lot to you, take the time to search for a vase that fits them all and does them justice!!