Are there any rules about what colors or fabrics you should use for Celtic knotwork?
If you look at ancient Celtic manuscripts, you see quite a wide variety of colors being used. In some cases, a given knotwork design is colored in uniformly with the same pigment; in other cases, several colors may be used within the same design. Sometimes the color changes serve to highlight a particular repeating portion of a knotwork design or interlacing border, while other times the color changes seem to have been made at the whim of the scribe. So–there really are no set rules about what colors you can use in a Celtic quilt. Pick what you like best, or pick a combination that is meaningful to you. Feel free to make choices that please yourself! I would make sure, however, that there is enough contrast between the color(s) you use for the knotwork and the color you use for the background to allow the knotwork to show up clearly. (Try overlapping your fabrics and then looking at them from the other side of the room–do the fabrics “moosh” together, or can you still clearly see whi