The traditional Mary Garden has its roots in Medieval Europe. The plants and flowers in a Mary Garden represent attributes of Mary. It is similar to an English cottage garden, but with Mary-related names. A Virgin Mary statue is prominent.
Yes, you can create a garden like this! Just look at the shapes: sharp spires, round globes, soft spires, and a few oddballs. Pick flower shapes in the same color family (pinks and purples, here), throw in a few silver foliage plants, and plant closely together. It's that simple!