Welcome students and visitors with these colorful classroom decorations, appropriate for doors or bulletin boards! 18 inches in diameter. Welcome students and visitors with these colorful new classroom decorations. Each bright wreath design offers a welcoming or praising phrase guaranteed to get everyone off on the right foot when they open your door and step into your classroom. You can even use the wreaths to create innovative bulletin boards. (18 inches in diameter) All Classroom Wreaths measures 18 inches in diameter.