http://openclipart.org/detail/109/red-round-error-warning-icon-by-molumen
http://openclipart.org/detail/35503/tango-emblem-important-by-warszawianka
http://openclipart.org/detail/23156/ok-by-dholler
http://openclipart.org/detail/103405/green-cirlce-hand-icon-by-kuba
http://openclipart.org/detail/103393/red-hand-icon-by-kuba