Ohhhh you are lucky, @basil! Feathers are great for so many projects 
Air spells, feather wreaths, feather brooms/besoms, and altar decorations come to mind immediately. Lots of possibilities! 
I love the idea of using natural dyes- beet root and turmeric make such lovely and intense colors! Blue butterfly pea may not be as strong, but it yields a gorgeous blue-purple color 
Have fun with your crafting! 