Insert on a new layer have several small squares, selecting previously the Rectangular Tool and the command Edit – Free Transform (ctrl+t).

Designing Marine Wallpaper

Then make a copy of the squares' layer (ctrl+t) and blur out the copy, using the following options: Filter – Blur – Gaussian Blur.

Designing Marine Wallpaper

We
have to copy the ornament's layer and blur out the copy with another value:

Designing Marine Wallpaper

Place the blurred copies under the basic ornaments' layers and change their colors, using Image – Adjustments – Hue/Saturation (ctrl+u):

Designing Marine Wallpaper

Designing Marine Wallpaper