The top one is based on coils of rope on a boat and reflections in the water.
I drew the design on tissue with a transfer pencil and transferred it to the fabric, but it wasn't clear enough to see under the needle so I drew over it with a Frixion pen, ironed it away and then washed away the transfer pencil.
This time I simply drew straight on to the fabric with the Frixion pen, stitched the design then ironed away the pen marks.