I am needing inspiration because I have only been doing cakes 5-6 months and so far I have basically stuck to basic cakes with buttercream filling and I would love to start trying out more different types of cakes and fillings....i dont know where to start and I would love to hear what your favorite filling or fillings combo is and your favorite cake....

I love chocolate cake with raspberry preserves filling, or ganache.
Vanilla cake with caramel cream, or strawberries and cream.

I love just about anything that goes with cake.

HTH
Danielle

so far, my favourite combos (that i have actually tested) are:

chocolate with hazelnut buttercream
chocolate with chocolate buttercream and raspberry filling
pina colada cake (pineapple cake soaked in coconut rum, coconut buttercream)

I just asked this same question a few days ago. I am in the same boat as you I am looking to try out some new flavors. Here is a link to my post.
JanH has provided a bunch of links about flavor combinations.

http://www.cakecentral.com/cake-decorating-ftopicp-5859126-.html#5859126

White chocolate cake with raspberry filling, vanilla caramel cake with buttercream, chocolate with cookies and cream filling, strawberry cake with cream cheese filling,peanut butter cake with ganache filling, cheesecake flavored cake with strawberry or raspberry filling...
So many great options and so few people choose them, they tend to stay safe with white or chocolate.
Tracy

chocolate Fudge cake with Bavarian Cream filling that has been flavored withmint extract. Yummmmmm!!!!

White cake with Lady Baltimore filling; chocolate with peppermint cream (sort of like Jenn's above, only pink); almond or white with tiramisu filling; and coconut or chocolate with chocolate-coconut filling.

Try mixing preserves into some ofyour butter-cream to try different flavors for fillings, as well -- it makes a quick and easy "mousse."

You've made some lovely cakes, by the way!