Here is a set of coasters which I just made, because I wanted to try out some marl crochet cotton.  This is kitchen weight ( similar to worsted weight, or #4; it does have four different colors twisted together as plies).

 The green and the red looked the best in person, with the deeper green trimmed one being the best.  The next best was the red trimmed one.  These are done in double and single crochet.    I trimmed one of each of the four in a color similar to one of the marl strands with the chain stitch.

 In person these two looked less good than the first two, and the white one was the least good of all.

From this project I learned:

That the marled cotton does not look muddy, as I thought it might.

The darker contrasting colors (the Christmas-y green and red) look better than a same toned color trim (the sage green trim).  The least good trim on this marled background was the white with its strong contrast, but lighter color.