The council bishops adopt an optimistic approach. The ritual life of the Church is grounded in Christ, in the Paschal Mystery. From this, material objects can assist people inclined to the spiritual, to the holy.
Thus, for well-disposed members of the faithful, the liturgy of the sacraments and sacramentals sanctifies almost every event in their lives; they are given access to the stream of divine grace which flows from the paschal mystery of the passion, death, the resurrection of Christ, the font from which all sacraments and sacramentals draw their power. There is hardly any proper use of material things which cannot thus be directed toward the sanctification of (people) and the praise of God.
Could it be that even our weak efforts at art, if well-intentioned, if well-received, might effect the change toward holiness we assume is part of the common mission of the Church toward believers? Hope so.