Will any of these models work?
Sun Palace and Greek-looking pillar/temple type place
http://sketchup.google.com/3dwarehou...=Search&reps=1
Chariot
http://sketchup.google.com/3dwarehou...24&prevstart=0
Another Chariot
http://sketchup.google.com/3dwarehou...ad&prevstart=0
And I just made a black guy and girl with the Isis and Cleo models bult into Alice. Just color the torso and both legs grey and it darkens the skin realistically. Afterwards add a white parabola to the shoulder if you wish to replace the now greyed-out shoulder strap (the rest of the toga is fine) and you've got a pretty good looking kid in a toga.
And as for Apollo, since he's such an obscure figure (compared to the more famous Greek gods like Zeus, Hades, Aphrodite, etc.), I doubt you'll find an exact model of him, so I'd recommend dressing up the Native American model as Apollo (just delete his headband and he becomes a random muscular guy).