A kit for decorating nails, comprising: a nail polish that, when applied to a nail of a human digit and dried, has a tacky surface; a decal application tape, including a substrate, a plurality of decals adhered to the substrate, the plurality of decals and the substrate having a first adhesion coefficient therebetween; and a decal application apparatus, comprising: a housing having a rotation support structure dimensioned to rotatably support a supply spool around which the tape is at least partially wound; an actuator coupled to the housing and moveable between an unactuated position and an actuated position; a tape advancement arrangement coupled to the actuator and arranged to actuate a tape grip to extend the tape from the supply spool as the actuator is moved from the unactuated position to the actuated position and back to the unactuated position; and a decal application surface coupled to at least one of the housing and the actuator, the decal application surface being sufficiently pliable to conform to a range of nail shapes and sufficiently firm to press the tape against the nail when the actuator is moved towards the actuated position to transfer at least one of the plurality of decals from the tape to the nail, wherein the plurality of decals and the tacky surface of the nail polish have a second adhesion coefficient that is greater than the first adhesion coefficient, wherein the plurality of decals and an uncoated surface of the nail have a third adhesion coefficient that is lesser than the first adhesion coefficient, and wherein the plurality of decals and a surface of a dried regular nail polish coat applied to the nail have a fourth adhesion coefficient that is lesser than the first adhesion coefficient. a nail polish that, when applied to a nail of a human digit and dried, has a tacky surface; a decal application tape, including a substrate, a plurality of decals adhered to the substrate, the plurality of decals and the substrate having a first adhesion coefficient therebetween; and a decal application apparatus, comprising: a housing having a rotation support structure dimensioned to rotatably support a supply spool around which the tape is at least partially wound; an actuator coupled to the housing and moveable between an unactuated position and an actuated position; a tape advancement arrangement coupled to the actuator and arranged to actuate a tape grip to extend the tape from the supply spool as the actuator is moved from the unactuated position to the actuated position and back to the unactuated position; and a decal application surface coupled to at least one of the housing and the actuator, the decal application surface being sufficiently pliable to conform to a range of nail shapes and sufficiently firm to press the tape against the nail when the actuator is moved towards the actuated position to transfer at least one of the plurality of decals from the tape to the nail, a housing having a rotation support structure dimensioned to rotatably support a supply spool around which the tape is at least partially wound; an actuator coupled to the housing and moveable between an unactuated position and an actuated position; a tape advancement arrangement coupled to the actuator and arranged to actuate a tape grip to extend the tape from the supply spool as the actuator is moved from the unactuated position to the actuated position and back to the unactuated position; and a decal application surface coupled to at least one of the housing and the actuator, the decal application surface being sufficiently pliable to conform to a range of nail shapes and sufficiently firm to press the tape against the nail when the actuator is moved towards the actuated position to transfer at least one of the plurality of decals from the tape to the nail, wherein the plurality of decals and the tacky surface of the nail polish have a second adhesion coefficient that is greater than the first adhesion coefficient, wherein the plurality of decals and an uncoated surface of the nail have a third adhesion coefficient that is lesser than the first adhesion coefficient, and wherein the plurality of decals and a surface of a dried regular nail polish coat applied to the nail have a fourth adhesion coefficient that is lesser than the first adhesion coefficient.