Hi mate, and welcome to the forums.
We all have very different tastes here, and this is reflected in our cars. By scrolling the opelaus album, and looking through some posts, you'll find an endless array of components and accesories for your gf's astra.
Please feel free to post for help, etc. We are only too happy to help you.
BTW, my astra's mod list is in my sig (a little skinny, I KNOW )