Got him/her (I think it's a her but still not sure) 2 weeks ago, and she was just a little thing - she had a blue tint to her fins and her body was brownish in color with horizontal stripes - she was pretty plain looking. Over the last 2 weeks her fins have turned red with a blue fringe, and today I see that she has lost her stripes and her body is turning a lovely purplish blue color. And she's grown alot - she has a voracious appetite, even for a betta.
This is my first baby and I almost didn't get her because I've heard most of them are in pretty rough shape by the time they reach the stores. But I had a 2.5g quarantine tank set up for a girl I was supposed to have shipped to me, which didn't come thru, so I decided a baby would do nicely in there for a few months. Hopefully she will continue to thrive.