To avoid a polka-dot look, try several stems together for bold blocks of color. Most important, loosen up, have fun, and don't overwork it. When you first think your arrangement is complete, it's time to stop. Once dried, store your flowers in a covered wicker box or similar container that allows air circulation. Never use plastic.
Cardboard boxes are suitable, but cut several holes in the sides and top.
The fixers don't dry the flowers. However, they coat and strengthen brittle stems and blooms, and dried flower arrangers recommend them. After the spray treatment, wrap each bunch loosely in tissue paper or newspaper, and lay it flat in the container. Put heavy flowers on the bottom, and don't pack the box too tightly. Keep your storage boxes in the same cool, dry areas you used for drying.