I followed a pattern designed by Amber at Crazy Little Projects What I love about this pattern is that Amber says it's the first time she has designed a pattern on her own. She provided a PDF of the pattern, and it was fun to try someone else's original design.
These were super-easy to make.
I made this one for my six-year-old daughter. Even though the bag is reversible, she decided she only wants to use the cat side, and so she picked a vintage button from her grandmother’s collection to use as a closure.