2 Ways:
Manually:
Pick some elements.
Now zoom in (Z key), press [ key to make cursor smaller (down to 1px), and click. There, a pixel of something. Now move your cursor 1px to the right or left. Place another pixel of another element there.
This is just one type of alloy, and most alloys with interesting properties are discovered by experimenting with weird patterns. You can also use the *MIX tool to mix particles randomly together.
Using Weird Machines:
You can find or create some machines that use GPMP to periodically pull materials to one side and then another. They simply mix the elements together with gravity and electricity.
*nvm, MIX only works for powders
Doesn't it take hours to do it manually? and I can't find any working automatic machines for it.
And mix doesn't work for me with anything, even powders.. or do I not know how to use it?
Let's say you've made a 5x5 block of alloy so far. Just copy (Ctrl+C and drag to select) and keep pasting these 5x5 blocks until you've gotten a large enough block of alloy.
And are you sure you'r trying the right MIX tool? Go to the 'Tools' menu and select MIX from there. Just click somewhere where 2 powders meet. Try doing it while paused. It probably looks like it is doing nothing when unpaused because gravity and density. But you probably won't need MIX for alloys anyways.
I made my curor 1 px (smallest), but it still seems a little but bigger than 1 pixel when I add an element... or is it supposed to be thicker than all the other alloys?
Wat do you mean exactly? And 1px in TPT is not the same as 1px on a computer monitor, just to clear that up.
Basically, it's a small 3 by 3 square with slightly less visible corners
Meh I'm not sure. It's 3x3px, and that is fine. Happy alloy making
Oh I forgot to mention layering. Yeah, you can stack particles on top of each other for more wierd properties. This can be done either with the PROP tool (set x and y coords of 2 or more particles to the same values) or, the much better alternatives, lua scripts. You can find those on the script server. And you can have up to 1500 layers if you use EHOLE