It’s difficult to go wrong with a classic color like white for an arrangement. While it can create a striking bouquet, it’s also a versatile backdrop for fun and fresh pastels and bright colors. If you’re sending a gift to a girl, pink is a natural choice. For example, pink roses and lilies are a lovely combination for a First Communion bouquet. A blue boutonniere for a little boy is a classic choice. A traditionally gender-neutral color, yellow is also a good choice for a flower arrangement.