Use the blessing shrine and enter the following codes to unlock some hidden artwork and songs:

Code - Effect

3 Fruits, 18 Crystals, 6 Bugs - Unlocks an extra tune in the extras menu
44 Fruits, 55 Crystals, 11 Bugs - Unlocks a Vehicle Art slideshow in the extras menu
34 Fruits, 49 Crystals, 83 Bugs - Unlocks World Art slideshow in the extras menu