Example of a Batenberg Lace Look.
If you want to fill inside the pathshape outlines, just deselect the pathshape, ad use the magicwand to select, expend the selection to 1 pixel, convert your selection to an object, you will be able to fill your object with a texture of your choice.

Hint: If you would like to make a Batenberg Lace look, keep your object white or a light Ivory, apply the Emboss effect from the Texture Filter, a fabric texture is great for this. Then turn your Path shape in 3d using the same color as your object, set the with and depth very low, then merge as a single object.