Back when Nick GAS started, they had lots of downloadable clips on their site, which included some themes, IIRC. Not any more.
I honestly wonder how much longer Nick GAS will be around--When there hasn't been anything new on the main channel of the staple programming in *five* years (that's how long it's been since "Double Dare 2000" and "You're On!"), outside of one reality show, and the attempts at original sports programming are relatively few and far between--and it hasn't been converted to ad-supported *yet*--I wonder how long they'll hang on to it. NickToons is being more aggressive in picking up original or exclusive acquired programming (and the mothership will be providing rerun programming for decades to come), but Nick GAS just looks so static in its programming.