There's a bug in 1.0: If you place Broken Elytras in Item Frames, and there are Normal Elytras somewhere else in a Item Frame, the Broken look like Normal Eyltras but if you rejoin the world and place the Broken Elytras at first in the Item Frame and there are no Normal Elytras in a Item Frame somewhere else, and put then the Normal Elytras in a Frame they'll look like the Broken Elytras.
Update by @unknown:
Steps to Reproduce:
Place two item frames
Place Broken Eltyra wings in one frame
Place New Elytra Wings in the second frame
Notice both have 'broken elytra' texture
Notice the held elytra have the wrong texture also
This works the other way around too, place new elytra first, then broken second.
Also affects the texture in your hand.