Yes, there's a lot you can use. But there's also restrictions, which is why Creative Commons was embraced by other companies. If you're not doing the d20 route and want nothing from the SRD, then there's little benefit gained from the OGL.
So I already commented on this once, about not understanding what restrictions the OGL presents that are troublesome, but your statement made me curious as to what benefit there might be in using the CC license over the OGL license...
So I looked into it...
And I can't tell that there would be much of any advantage at all. In fact the CC might actually be something of a detriment to the goals of a publisher of RPG material. Firstly, there are actually six CC licenses and you need to understand specifically which one you want to use and why before you choose to use it. All of the CC licenses require attribution, same as the OGL, so thats actually a wash. Secondly, I am not sure that the CC licenses actually allow one to dilineate in a product between what is open and what is considered proprietary IP.
The OGL has the advantage then of being a known quantity specifically designed for RPG for-profit publication. It works exactly as necessary for this endeavor. It allows for IP dilineation at the discretion of the publisher, while still making rules Open and useable by other companies.
I must confess that I really don't see the point in messing around with a different license, with potential problems, when the OGL works so well, which is why I imagine most game companies tend to go with the OGL for their works if they want to make their works open.
I have to ask, what would be the advantage then of choosing the Creative Commons over the OGL? While one might claim the OGL is not superior to the CC, is the CC in any way superior in other ways? Why would one think that a gaming company would ever prefer the CC over the OGL?