In the challenge package were two plain sea green fabrics and one with a vague pattern. Fortunately a part of the vague pattern had the right dark sea green color.
Both pieces are hand sewed onto the background.
I made some small waves by sewing folds.
I learned from studying pictures that the sea is darker at the horizon.
The second plain sea green fabric has been cut.
Here is the lace trim. Does it look like foam on the waves or not?
It took some time to figure out where was the right place to sew the trim on...
....as waves in a distance have only little foam. The invisible part of the lace is hidden in the sea.
All about the "Message in a bottle challenge" can be found here.