The watermelon is a symbol of solidarity with Palestinians and against oppression.
I made the watermelon in Blender using my Watermelon Generator. I also used Geometry Nodes for the static water particles and for the 3d lines generation. The actual waves are sculpted in Zbrush.
You can get the watermelon Generator for free. You also find lots 3d print ready files there.
https://tocogames.itch.io/watermelon-generator
I also put up the designs on RedBubble
https://www.redbubble.com/de/people/davision3d/shop?artistUserName=Davision3d&collections=4000754&iaCode=all-departments&sortOrder=relevant
You are also free to use those images for anything you like as long is it not for a financial gain reason.
Free Palestine!
In sketchfab more stylized with generated 3d lines

A mix of both styles. Watermelon generator and 3d printing files here https://tocogames.itch.io/watermelon-generator