Select Brush Tool and choose an appropriate tip for your drawings wide. I choose 4 pixel tip :) In Paths palethe make Ctrl+Click choose Stroke Path.

As you see left make selection your drawings by help of Giude lines. Now do these: Apple+C; Apple+N; [Return] Apple+V (We made new document the selection drawing) :)

Make invisible the Background Layer! From menu: choose Edit>Define Pattern... give a name the pattern and close the dialog window by hitting OK button.

Let's see what we did? Select Paint Bucket Tool make its options bar arrangement as you see on left dawn. Open new document, i opened 640x480. Proces the tool in new layer. That's all!
See you soon.