Thanks

I looked around the net for some knotwrok for inspiration, then drew a segment by hand. Then it's a matter of copy and paste to put one large section together. I did the line work first. Then I did a layer with colour. I made sure to colour a large section by hand and then copied and pasted that. By doing a large section you remove a lot of the obvious repeating. Also, the colour layer was an overlay layer - so it still picked up a lot of the background texture which also breaks up the repeating. Then the same for a light and shade layer to give it some body. It takes a little longer to do each layer separately, but it really helps to integrate it into the map.