Here is a piece I just finished up which I thought was worth sharing.
I imported a tree from Forester Arbouretum to Blender using Accutrans3d as a format converter. I colored the leaves with fall colors and then set up two particle emitters to which I parented leaves. I then sent the leaves through a lattice. I also took an RGBA Targa Render of the Tree and made an alpha channeled tree to go on several planes behind the 3d tree in the foreground. The clouds are Metaballs converted to meshes with Blender materials/textures. The grass and sky are also Blender materials/textures.
I added the still and the AVI(2MB-Microsoft MPEG4) to the top of my gallery at www.creationanimation.com.
here is the direct link to the gallery.