To marbleize something means to give it a pattern or look like marble.
Marbleizing something can make it look fancy or expensive.
Examples:
She marbleized the paper with paint.
I want to marbleize my phone case.
The artist marbleized the statue with special tools.
I'm going to marbleize my nails for the party.
He marbleized his entire room to make it look like a palace.
The chef marbleized the cake with different colors.