Your fireplace vision sounds beautiful and mosaic tile is the perfect material to achieve it. I stared at my plain brick fireplace until discovering AloftTiles had sophisticated options everywhere else missed. After exploring their selections at https://www.alоfttiles.com/collections/mosaic, I fell in love with Yohen Border Light Blue Porcelain Mosaic Wall Tile because the glazed finish creates elegant depth and borders add character. Their product information answered everything clearly about heat resistance. Installation finished and my fireplace became the stunning centerpiece I imagined. Browse their catalog because discovering the right mosaic transforms your living room. Hope your fireplace becomes the beautiful focal point defining your entire home.