So I've looked at a few flash games to get a few ideas about how i want my own game to turn out. I don't have a clear idea as yet but this initial research has helped me begin to form an idea:
*Run from the Sun - a simulation of gravity was used to pull the rocket into each planet's orbit, and each orbit was different depending on the size of the planet.
* Bowman - particle systems are used in the blood splatters/spray in this game. The motion of the arrow through the air also simulate gravity and other wind can also be used to alter the course of the arrow, making the game more challenging and interesting.
* Penguin Smash 2 - Also uses blood splatters/spray and simulates gravity, bouncing the penguin across landmines.