The organic nature of gourds makes them work well with flower arrangements. Many vases are made from the top of another, larger gourd.
Please remember that these vases are made from gourds, which may be hard on the outside, but are very soft and porous on the inside. They are art, and are not meant to be functional. Dried flowers, or silks ones, will be fine; but the inside of a gourd will be damaged by water.