The ones in the picture were held in place by slipping into a slot that I cut in my breastplate. Since the breastplate was tight and sturdy it held the wings up. People do the same thing with corsets, by slipping the U part of the bend into their corset.
I made a second pair that was worn like a back pack held up by clear bra straps too. So there are a bunch of options!
Hey there, sorry for the late reply. Hope there is still time to help!
I colored my feathers using floral spray paint by "Design Master" that I bought in Michales Craft store. If you can find the paint in the right color you can lightly mist it over your feathers to hopefully get the right color.
If you have access to an airbrush you could use a light colored air brush paint with some fabric medium mixed in and do the same thing.