Option 1: Duct Tape. Wrap that bitch up so tight it will never come apart again! On the downside it may make the touchscreen unusable.
Option 2: Hot glue. Smear hotglue on your kitchen table and gently place the 17 pieces randomly within it. Once all of the pieces are firmly set within the glue, completely encase them with more glue. This is to protect them in case the phone gets dropped again. The glue is clear, so you should be able to see the screen. (Quick tip: Use a sharp pin or needle to pierce the hotglue so that you can interact with the touch screen.) Note that the hot glue will melt when the temperature rises so you may want to think about moving to Syberia or somewhere where the temperature does not get very tepid.
Option 3: Super Glue. Once you have the phone back together think about super gluing it to your hand so that it doesn't get dropped again!