Many brides hold white bouquets. They can be all on type of flower, like white roses or mini carnations. They could also be a combination of flower types, like dendrobium orchids with white roses and/or carnations. A nice white ranunculus bunch would be a nice alternative to white roses.
There are many beautiful color combinations that can be mixed with white roses or held alone. If you like blue or violet, delphiniums are a nice choice. An iris is also lovely in blue. For those of you who like pastel colors (the colors of spring) pink and purple blossoms and pink roses might be right for you. An iris might come is white and yellow, too.
A bunch of baby breaths add a nice touch to the arrangement. The ribbon on the bridal bouquet is usually white, but you can match the ribbon to the wedding colors or bridesmaid dresses if you like.
Speaking of the bridesmaids, what are they going to carry? Sometimes these ladies have a smaller version of the bridal bouquet. Others have done a single flower that is white or matches their dresses. A simple group of pink carnations might do.
Sweet peas are also a lovely delicate flower that you can get in lavender, pink, white, or pretty much whatever color you like. They are also a lovely combination with hyacinths, which come in different colors as well. You may want to save the rose combinations for your bridal bouquet.