The small ruffled blossoms of the delphinium plant give a bright periwinkle blue coloring to a boutonniere. Multiple buds and blossoms should be used when making a delphinium boutonniere for an adult. One blossom will work well for a young boy. The blossoms are taped into a bundle and supported by a piece of wire or leaf steam. If ordering the delphinium, make sure that it is stipulated that you want periwinkle rather than navy blue florets.
Dyes and sprays are available to color a white carnation a periwinkle blue shade. Miniature carnations are appropriate for a younger person to wear. Lightly spray the edges of the entire set of petals a periwinkle color. Ask a florist to dip the heads of carnations in a periwinkle blue dye for your wedding or party boutonnieres. The white flowers can also be soaked in dye-tinted water to change color. The longer a carnation is soaked in water that contains dye the darker the coloring will become. A natural blue carnation does not exist. A violet blue carnation named "Moondust" has been genetically engineered by Australian scientists at a company called "Florigene."
The flag iris has a striking blue color that is well suited to a periwinkle boutonniere. The flower can be coupled with a bud for a wedding participant or party goer. The hollow stem of the blossom should be wired and secured with floral tape to keep it from splitting open.
The blue hydrangea blossom is a sturdy flower for a boutonniere. Combine three to five of the four-petal florets with one small hydrangea leaf as a backer piece. Wrap floral tape around the stems to secure the leaf and florets together. The rounded ball shape of a hydrangea can be maintained or you can make a crescent shape with the stems and florets.