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So what I was looking for was something like this:http://hobbyhottips.storenvy.com/collections/198143-for-both-troops-terminators I was wondering

what type of plastic is good for that, or if anyone has any experience making one's like those.

I've never tried anything like that but it looks fairly easy.

I'd think a sheet of plasticard would probably work, as long as it was thick enough to let you push down without breaking. You can get clear plasticard, but I can't really see the advantage.

The only issue I see is cutting it yourself. You'd have to be careful to get the corners to meet at exactly the right spot otherwise the overcuts would weaken the plastic to wear it might crack after using it only a few times.

'Polymorph' or friendly plastic, both pretty much the same thing, thermo plastic. Heat it up in hot water, and it becomes soft and malleable. while in this state it will take an indentation, and then harden as it cools, thus can be used as a molding material. Both of these go fairly rigid and hard when set, and can be remelted.
Another probably more popular product for this is 'instant mold' or 'oyumaru' (both the same thing), both are probably better than friendly plastic, green stuff and other epoxy putties will not stick to it when cured, so no molding release agent is not needed.
Instant Mold or Oyumaru works much the same way as polymorph only isn't quite as rigid when set (which allows for slightly more complex pieces to come out of the mold easier. Can be re-used again and again.
Works really well for duplicating bases, flat details (like what you were talking about, and can be made into 2 part molds for more complex pieces. Its never going to be as good as the plastic injection molding that GW do, or spin casting that FW do, but its incredibly useful in the tool box for making one off items or duplicating an icon from something etc.
edit; please avoid talking about or showing us any GW copyrighted shapes you may want to or may have copied as its a forum rules no no and ends up in a locked thread
plus it probably really winds up the folks at GW lol! As a rule of thumb; these products will work with any part, but its an act of piracy to be replicating parts that someone else sculpted (and copyrighted). Although I doubt they'd give much of a hoot about the copyright involved in a job such as copying a shoulder pad emblem for a one off etc. its just best to not open the can of worms I've found
If you sculpted a skull.. or anything out of greenstuff (or something else equivalent) and mold that part in oyumaru (Japanese original brand of instant mold; cheaper ) you can then fill the mold over and over with green stuff to replicate the sculpting work, and once you have enough the mold can be reused to mold something else simply by throwing it back into hot water

One thing I will add about instant mold is that it's only so-so for making two-part molds because it doesn't lend itself well to that level of precision due to its flexibility. However, it is EXTREMELY useful for taking icons & the like. I used it to copy the chest eagle off a SM torso & GS a copy of it for the greave of a chaplain model I'd built. At one point GW actually encouraged such copying using GW & vaseline, but that's gone by the wayside in recent years unfortunately.

so, the stuff in the link OP provided looks to be as thin as the old transparency sheets used for over-head projectors.

something like this: http://www.officemax.com/office-supplies/presentation-equipment-supplies/transparency-film/product-prod4650006?R=11032928&ssp=true

cutting curves out of that stuff would be a pain, but it should work about the same as the templates that guy is selling... and the technique looks pretty useful. Thin, flexible insignia... custom made when I want... yes please. Now off to the the office store.

 Red_Starrise wrote:
One thing I will add about instant mold is that it's only so-so for making two-part molds because it doesn't lend itself well to that level of precision due to its flexibility. However, it is EXTREMELY useful for taking icons & the like. I used it to copy the chest eagle off a SM torso & GS a copy of it for the greave of a chaplain model I'd built. At one point GW actually encouraged such copying using GW & vaseline, but that's gone by the wayside in recent years unfortunately.

Interestingly enough back when they encouraged it, most of the sculpts were hand made. Now theyre cad designed, laser cut molds for the plastic kits I beleive.

So they were openly okay about copying when it was all human sculpting work, but now its a cad designer instead of a hands on sculptor theyre not so openly suggesting it. hehe strange eh.

And yes id tend to agree about the limitations of instant mold/oyumaru, Ive tryed various bits with some success and a lot of failures seems acceptable for a one off.. you can keep trying again untill it comes out decent enough but for making more than one or even two copies of something its just not the thing to be using (that would be rtv rubber and casting resin setups instead)