Okay, now that I have time to be on here longer, I'll give more feedback then just "man, this is awesome!".. xD;
First off, I LOVE the colors you're going with.
I dunno if they'll change in the future, but I think they just fine as they are.
Garchomp's brightness makes it almost looks like it's glowing, which is awesome in contrast with the darker background. The matching logo colors are also eye-candy in the forum text. xD Of course that could just be my opinion, because I love those shades of blue. *__*
Also, the buttons on the header (Blog, User CP, etc.) look really nice, and that's definitely a more creative way to display them.
The tables also look nice. What surprised me at first was the fact that you kept the tables smooth/flatter look, instead of any sort of emboss effect for the headers. which people tend to do these days. xD Due to that some of it looks a bit plain, but it's also not bad. Makes the theme more unique.
Lastly, the text on the quote button looks a bit blurry. Maybe go with a different font?
& for the 'Post Reply', I'd add a stroke to it, so the text sticks out more. They do look nice, though. As far as colors/sprites go. xD
/rather looong two cents.