It can be done on 14 count, since that is the same as 28 count iver 2 squares!
Don't know what you mean for "color swatches" but, under the category "Floss & Thread" in the box to your left on every page, will show you color images of floss. No swatches available here. Colors often are not exact as so much depends on what application and what monitor is used on both ends.