What are some nice color combinations for crocheted afghans?

Make one blue and gold and the other blue and mauve. Use either two shades of blue or two shades of the other. Then you actually keep it to two base colors which will make for a much nicer combination. A grayish blue and mauve looks very nice together. A royal blue goes well with gold. It is very nice of you to use your extra time at college this way. I am sure they will love their gifts.