Paper flower http://ameblo.jp/heavenly-flowers2012/entry-11306736079.html
stalagmite technique? could vary the size, but tissue paper is so much cheaper than the spray foam. Not necessarily flowers but something else in giant size? - Giant Tissue Flower | Tutorial (some steps)
Tissue paper flower tutorial
Poppies - try with streamers http://www.foxyfolksy.com/2014/10/diy-project-autumn-wedding-how-to-make-paper-flowers-part-1.html
Learn the secrets to perfect crepe paper flowers. Crepe paper rose tutorial and rose petal templates.
DIY - Tissue Paper Flowers ( I love these <3 I made these but much bigger to hang from the ceiling of our wedding reception =) They looked great & the lights bounced off the colored tissue paper which made it just beautiful throughout our venue!
Why have a bouquet of small flowers when you can have giant ones? Giant Paper Flowers | Studio DIY