Found this pretty cool TMNT beanie on Etsy by lpatch13:
Both Ninja Turtle beanie & eye mask are handmade with 100% acrylic yarn with my very own pattern! The hat and eye mask are 2 seperate pieces that can be worn over your eyes or pulled back on top of head/beanie. The eye mask is a complete circle made to wrap around head/face (but can also be made to connect in the back with velcro if specified).
The same shop also has sells a Castle Crashers Beanie:
That mannequin is really creepy…