I wanted to create a design that didn't involved multicolours so I decided to have a play with using infill to create contrast.

This is my Dolphin Infill Bowl, I used 30% tri-hexagon infill on the body (with no walls or top and bottom layers) to create the circles for the dolphins to jump in front of, and I set the dolphin infill to 100% to make them stand out.

You can experiment with different infills and percentages but I would keep the infill above 20% to make sure the bowl is stable.

I have attached the stls and two 3mf files, one for Bambu Studio and the other for Creality Print.