I'm quite interested in the idea of mixing 2D animation with 3D animation. I've actually done it once, in Shroomz, one of my animations from last year. Although, it was very minimal and my method was nontraditional.
Anyways, take a look at some miscellaneous stuff I've been making in blender!
This last one here is arguably my most ambitious scene, so as a result it has some kinks to work out. Notably in the texture and skybox department.