Retaining wall how to...Better Homes & Gardens site.
Mosaic Wall...I LOVE this!
How to - retaining wall.
terraced garden + steps
Gabion retaining walls
size of the photos are 10x15 from Ikea, she arranged the photo frames on the floor before we hung them on the wall.. might help you too, first we put on the wall the middle column, then the right side of the heart and we finished with the left side.