A pattern piece with a sort of fixed-wood texture. The lines and hatching could be texture or simply shading but either way it looks appealing to touch.
If our concrete floor cracks, we're doing this to it! It's concrete with liquid gold to fill the cracks! (What the crap who thinks "hmmmm concrete cracked. I'll fill it in with gold!" What even kinda Scrooge mcduck lunatic is this?