Under his direction, "Talleres de Arte" fabricated work in a variety of styles: Mozarabic, Romanesque, Gothic, Baroque and Rococo. Granda sought inspiration for his artwork from the beginnings of Christian history to his own time. When describing the iconographic schemes in his work, he often justified them by the precedent of Christian antiquity, citing studies by the archaeologists Antonio Bosio, Giovanni Giustino Ciampini, Giovanni Caetano Bottari, Rev. Giuseppe Marchi, Giovanni Battista de Rossi, Louis Perret, Rev. Joseph-Alexander Martigny and Alphonse de Boissieu.