For my 3Dcember project, I replicated 12 of my favorite items from The Binding of Isaac (Rebirth + Afterbirth). Plus the pedestal rock, I guess. I did 3 items per day, over the span of 4 days.
Except for a few simple items, my process for creating every model is as follows: first, sculpt an approximate shape of the item, and then decimate it down to ~1k triangles. Push/Tweak to final shape, then quick UV unwrap and paint. Once the model is textured, duplicate it and extrude by a small amount, invert the normals, and set it to single-side rendering. Assign a black material to that and you get the outline effect. I also made a keyframe animation for the bounce and applied it to every item.
This is all shadelessly lit; lighting is painted directly into the model.
Modeled and animated in Blender, textures painted in Substance Painter with touch-ups in Krita.