HELP with color or theme

first i would like to start with saying thanks to team gallery... the G2 is awesome! i've use gallery for many years know... and its always on top of their game...

but i would like to know how can i make my G2 fit the color theme that i already have... the 1.x, i just plug in some css on the side bar... like http://prophecyevent.com/main.html?page=gallery i have over 24,000 pix and still growing!

now on my new website (might need to click on gallery)
http://enticechicago.com/interface/frame.html?page=gallery

can anyone point me the way to start changing the color theme, or if i can download a theme... even better!

again, to the staff of gallery! thanx, your all doing an awesome JOB!