What do you think it is? 1 x 12 ceramic?

The last image does seem to be 1"x12".

The first two images seem to be shorter, maybe 1"x4"? And maybe marble to match the counter top/window sill?

Something like asian statuary big brick pattern is a wee bit over budget.

Or something like white thassos big brick pattern might work if you found it on sale.

HTH, tmy

Thanks. How is the Tilebar? Good quality? I have never heard of them before.

Any other suggestions on where to find tile like this?

Tilebar.com was previously known as GlassTileStore.com.

I've not done business with them, but became familiar with them through previous threads here on GW.

This Google search may be helpful: Google search for GlassTileStore on GW