black colored rough messy dirty blackboard or writing slate with scuff marks, textured effect grunge vector horizontal background that is plain blank and empty - 黑板 幅插畫檔、美工圖案、卡通及圖標
back to school with green chalkboard background and icons of school items drawn on the blackboard with white chalk. vector illustration - 黑板 幅插畫檔、美工圖案、卡通及圖標
young female student studying at blackboard, education, back to school, exam preparations - 黑板 個照片及圖片檔
rustic weathered textured effect empty blank black vector backgrounds with scratches and peeling off paint like a scuffed weathered blackboard or writing slate - 黑板 幅插畫檔、美工圖案、卡通及圖標
abstract for background wall dark red stone texture smooth surface material, cement floor - 黑板 個照片及圖片檔
