Watercolours comes in 10-yard skeins. Some of the colors have a lot of contrast; others are more muted. There are dark, bright, soft and pastel shades. In almost every case the colors blend into one another so there are no sudden changes.
For needlepoint use one ply on #18 canvas, two plies on #12, 13 or 14 canvas and three plies on #10 count. Use one ply on Congress Cloth (#24) for bargello or upright stitches over several threads. One additional ply is necessary for bargello and some decorative stitches on larger counts of canvas.
For cross stitch, in general use one ply on your fabric. Work cross stitches over one thread for #11 and 14 counts, over two threads on #18 and 20 counts. For hardanger, use one ply of Watercolours for the kloster blocks on 18, 22 or 25 count fabrics.