My favorite color is orange, but I think my sparkle may be green, because I'm a druid and all... I like other colors too, like blue and purple, so please tell me what color it actually is! I'm an earth pony, so I can't see it myself.
As for what makes me happy, it's quite a lot of things. Math, science, programming, strategy games (and some other kinds of games too), good music, nature walks, eating pizza, having fun with friends and, of course, ponies!