I'm trying new avenues of craftiness: namely with flowers.
I've been scavenging my workplace for the wilted rejects and seeing if I can preserve them. Valentine roses= potpourri and voila! Trash to treasure.
There is no secret that I know of. Rip the petals from the stalks, keep exposed to sunlight, and agitate frequently to avoid mold. I have a lovely window box outside my kitchen, and spread the few dozen roses along the shelf for maximum sun exposure.