What To Put In Fireplace Alcoves . If you’re always having to bring in folding seats and dining room chairs for parties and gatherings, this could be the perfect permanent solution. Create a library in your alcove. Fireplace Nook + Wall Decor Niche decor, Alcove decor, Wall nook from www.pinterest.jp Create a contrast in an alcove with wallpaper. Build in alcove cupboards to display and disguise. Bare brick and reclaimed wood.