Use them to make a dried floral wreath on either grapevine, or a styrofoam wreath, covering the foam with "Reindeer Moss" and hot glueing the flowers. OR Put them in a shadow box frame or laid out with other memorbelia in a display table.
Talk to a store that does custom frames-- make a deep frame with a velvet/velveteen insert-- set up your dried flowers and glue or ?? to the velvet-- have them make the frame as air tight as possible-- I'm sure they've done something simular before. hope this helps.
Honestly, I would just throw away old prom flowers or use them in potpourri. However, I went to a wedding a few months ago where they had a copy of the grandparents' wedding invitation and the grandmother's wedding bouquet, and I thought that was really touching. If it hadn't been soggy for days after my wedding, I would have kept my bouquet permanently.
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