This is a really simple Instructable, but I wanted to post it because sometimes it's just a matter of seeing something's post and going "oh yeah! that could work!".
One issue I have sometimes is getting an idea but not knowing what the pieces involved are called or what even to search for as far as the individual parts or a project might be.
For me, making a model version of what may become full sized wings for a costume started with the idea of using wooden coffee stirrers and something along the lines of brass fasteners. But the brass fasteners I was finding were too big.
* Wooden coffee stirrers - Available in almost any grocery or office supply store
* Mini Brads - Found in the scrapbooking section of Michaels Crafts
* "Drill" - Similar to a "pin vice" but with a non-removable drill bit. Found in the jewelry/beading section of Michaels, used for drilling small holes in beads
I really like abelfox's sketches to work out what the wing size and webbing would be. And rachel has a nice video showing both the straps attached tot he second bottom joint so the wings extend when she raises her arms as well as how you can set them on the "backpack" frame to pivot forward with your arms. Lot of other examples use some kind of pulls that you have to manually use but attaching the second lower joint to your elbow gives you enough play to use your arms without activating the wings while also still being able to extend and pivot them in a natural way. Very nice.
You could also use this to create model wings for toys/dolls/etc fairly easily as well.
I may update this later if I have anything useful to add. Feel free to send me questions and I'll respond as best as I'm able.
This is my first Instructable, so forgive me if anything's a little goofy. If anyone has any tips for me, I'm happy to listen.