One of the recent additions is TessieBugs. It contains tessellating butterflies, moths, ants, and other creepy, crawly insects.
The other is TessieOddsNends, a hodgepodge of things that did not make it into any of the other ten faces.
Each contains two styles, a solid style that must be colored in order to see the shapes (after all, a tessellation fills the plane with no gaps or overlaps), and an outline style that can be used alone or layered over the solid style.