Looking through the many threads, it seems like the only subjects worthy of macro are insects, flowers, and occasionally water or money.
What else do you use your macro for? I'm not much into bugs, flowers are ok (my wife owns a flowershop, so I'm not excited by flowers much), and money and waterdrops don't typically do it for me as well.
I have a Sigma 50mm Macro that I used to take some shots of flowers with, and they came out great, but what else can I do with this lens? It's an FD mount, and I use it on my AE-1.