Let's play a small game first:
Illustration: Has the bounty been awarded?
Here are two images cut from two screenshots. One of them has an active bounty, while the other has an awarded bounty. Make your guess base on the images!
Haha I bet you can't, so here's the answer:
Actually they look identical! Shouldn't that be changed and make unawarded bounty (the "award" button) look lighter like the grey tick for "accept this answer" button do?