In the Pattern Request section I mentioned something I had learned about Inkscape. Probably most of you know it but I didn't so there might a few others who don't.
When I tried to make a pattern from text, I could never get nice sharp lines to follow. I would change the colour of the text to a light grey, then try to trace the bitmap - it never gave a sharp line to follow. Very frustrating.
Finally I tried tracing the bitmap first, then changing the inside colour to a light grey. It worked like a charm.
Hope this is useful.
Jim