A few years ago, I made this for my girl. She loves sea turtles, and I hope you'll enjoy it too.
Just print it and use it as is, or bend it over a wine or beer bottle while immersing it in warm water. Bend it slowly with enough heat, or you might risk breaking it.
The sea turtle was designed by wslab from Thingiverse (https://www.thingiverse.com/thing:2266488)