  We report self-consistent quasiclassical calculations of spontaneous currents
and magnetic moments in finite size unconventional superconducting systems,
namely: (i) in isolated d-wave superconductor islands where, in addition to the
dominant order parameter (with a d_{x^2-y^2} symmetry), a subdominant order
parameter of s or d_{xy} symmetry is added; (ii) in grain boundary junctions
between two arbitrarily oriented d-wave superconductors, and between a d-wave
and an s-wave superconductor. We show that the profile of the spontaneous
current density and the magnetic field distribution depend on the time-reversal
symmetry breaking properties of the system. For the d_{x^2-y^2}+id_{xy} state,
vortices appear near the edges of the finite size systems. We associate these
vortices with the chiral nature of the mixed order parameter. The method
developed here is quite general, and can be used for predicting properties of
any finite size superconducting system.
