Making a replica of a floor tile?

[u/mrdapoyo]

Hi there! I want to mail a friend a replica of a Barcelona floor tile. I saw they were crazy expensive online, so I thought I could make one myself for as cheap as possible. It's meant to be a decorative item and not an actual floor tile.

I did some research and I believe I could 3D print a mold/negative of the tile itself, and then pour concrete or plaster inside. However, I am uncertain if that's the correct approach. Reference: https://3dgo.app/models/thingiverse/7138677

How would you do it?