How about the Greek classical elements?(I know it's classical, not mythical, but I think it has potenial.) Since we have water and fire, maybe we should add them into the game and implement some sort of system for some sort of chemisty/alchemy.

Or we could add fictional elements like adamantium (used for bunker,sheilding,and reactors), carbonite (used for cooling), tibanna gas(as an alternative to carbonite), or red stone(as a philsopher's stone or as some sort of wire).

http://en.wikipedia.org/wiki/Caloric_theory

@cyberdragon (View Post)

 That reminds me. How about the fluid theory of electricity?

http://en.wikipedia.org/wiki/Fluid_theory_of_electricity

@Cacophony

YES! (creepy whisper) "Must have more!"

Lag powder toy? More like crash your computer!

P.S. 

@Cacophony

Look what you have done! You have made me make myself look stupid!

https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=16749

Mr.Giggles

@cyberdragon (View Post)

 I was thinking more of destroy mouse in fit of rage.

And, wow, I suggested the same theory that you made a script of.

Elaborrating on the classical elements, we could have a system where by heating and cooling some elements and drying and wetting others (perhaps through a new pair of tools) transmutes them into other elements(e.g. "drying" water gives you earth). Given, the system is quite useless and might break some saves, but it might be worth implementing.

Or how about Thales's principle that everything is made of water? Thorugh certain reactions, we could have it so that you could transmute water into other elements through combinations of heating/cooling , pressure, and/or certain elements.