I know most of us use Prima Flowers and tend to store them in their original packaging. Try some of these ideas to change it up.
1. Leave them in their original packaging
2. If you don't care if they're all jumbled together, a Mason jar works wonders
3. Baby food jars
4. You can also try empty spice jars on a lazy susan type thing. I've been told this whole set (jars/spinner) can be found at CVS in the seasonal gifts aisle when they put their Christmas stuff out.
MY CHOSEN METHOD:
Use ziploc baggies for optimum space saving. Place the flowers flat in the baggie and zip 90% of the way. Leave this little opening and squeeze the air out and zip it shut. (This is the method I use and I have aobut 10 different Prima Flower packages in a 6x4x2 space....and I still have room for more!!) This not only is a space saver, but it also makes it easy to tote them around for crops and such.