We've released some terrain accessories for your modeling convenience; a billiard set and three packs of curtains in various styles. The curtains are designed to glue easily to the inside of buildings with an integral cleat at the top that holds them out from the wall to accommodate most window styles.
Maximum window dimensions are given on the catalogue page of each curtain style so you can determine if they will work for your buildings.
They definitely work for Gunfighter's Ball buildings!