So you're sitting there, playing Powder Toy, and BAM! You get an idea! So how does it get in? Well first of all, make sure it has more then one use. Second of all, make sure it hasn't been suggested. Suggested Elements are listed on the wiki, and others on The Do Not suggest thread READ THOSE FIRST! You'd be surprised to see how many times movable solids or magnets have been suggested.

Now, Powder Toy is written in C programming language. This means that not very many things can be done without dramatically changing the code. For example, one pixel thick walls? Not possible. Pressure is built on a 4x4 pixel system, it cannot be changed. So, please view the source code (available for download at the download screen) and see what you can make of it. If you cannot make heads nor tails of it, please suggest only the best of the best of the elements you come up with. If you can, please see if it can be possible. This way, no one will insult you when you suggest it.

Also, please use common sense. Things like Copper or Silver? They're just metal. Normal elements cannot block pressure because of the above 4x4 system. Wifi and portal have channels, you have no need to suggest portal2 or wifi2.