You must have BLUE BLOCK and MAGIC BACON WALLPAPER to make BLUE WALLPAPER. BLUE WALLPAPER belongs to wallpapers category. Planting BLUE WALLPAPER and kicking back is the right attitude. Is this farmable? Good leveling up material if the answer is yes. Hitting it will break it but you need to count the hits yourself. By default you should get at least 1 seed back. Gemratio of BLUE WALLPAPER is a mystery. Maybe you can check the wiki for <a href="https://growtopia.fandom.com/wiki/Blue_Wallpaper">blue wallpaper</a> Massproducing BLUE WALLPAPER can be tricky. You will find out after you have harvested a few.