Floating Flower Tip - Most flowers float pretty well on their own until they start to pool with water and slowly sink. For a longer lasting centerpiece, use bubble wrap to make little skirts for your flowers.
Floral Foam - Florist Supply for Weddings - Hanging Garland Learn how to make bridal bouquets, wedding corsages, grooms boutonnieres, church and reception decorations and more. Buy wholesale fresh flowers and discount florist supplies.
DIY Paper Clay Barnacles - by Design Sponge - Tutorial - Very easy to make and looks really cool when done. Going to have to take this idea and use it to do make some other things I've been thinking about.
Homemade glue : Flour, sugar, water & white vinegar = better cheaper Mod Podge (brand of glue useful for collages and other projects where you want to stick things down or seal a surface). It's too expensive.