For an interesting play on color, try one-row stripes! Use as an all-over pattern, or intersperse single rows of color here and there. This could also be used to break up color pooling with variegated yarns.
Keep your row count in mind when using this technique. When you free pass, the row counter advances, but you haven't knit a row. You need to manually adjust the row counter each time. (If the row count is even, the carriage should be on the right.)