I got this boy from PetSmart.. I don't know how it is at all PetSmart's but the two near here sell their Halfmoons at a very young age and many of them are actually Deltas and not Halfmoons, but they tend to get Betta names wrong all the time..
Anyway, Steel was very little when I got him and was gray, steel blue with somewhat clear fins with hints of that steel blue through them. Now he's black, steel blue and red and so sooo much bigger. He's still not nearly full grown but he's matured so much and has really come into his color.
When I first got him I was kind of figuring he would turn out to be a Delta but he's definitely a HM. It's really hard to get good pictures of him with his fins flared because he only ever does it for a second before racing off and my camera isn't nearly fast enough to catch it.
Here a pic of him before and after... I added a few of him from when he was smaller as well as some more from earlier in the week. :)