Use powder food coloring, especially for the dark colors, make it a day ahead and mix it well again the day you use it. With the powder food coloring, you don't have that "separation" like you do with the gels. I learned the hard way too.
How about a car cake with a female in it? Luggage on top or a convertible with luggage in it with a sign on the car that says, "George bound" or "George, here I come." "George" was a generic name for the guy. You could even put a bridal veil on the head of the female in the car.