CubeArtWorld

It's a 3D sandbox online game where everyone participates in only one world. You can use your avatar with VRoidHub, and you can create your own canvas cube that you draw and program it in the world with your message. Any changes you make to the world will be passed on to all the other players after a few hours.

It is basically free, but you will be asked to pay a server usage fee when editing a world. Please be aware of this.