I had not heard of Hype before so I had a look and there is virtually no documentation :-(

As far as I can see the the following code should work - it assumes your HDrawablePool object is called pool

1. HIterator<HDrawable> iter = pool.iterator;
2. HDrawable drawable;
3. while(iter.hasNext()){
4.     drawable = iter.next();
5.     // do what you like with drawable but if
6.     // you want to remove it from the pool use
7.     // iter.remove();
8. }

Awesome! Thanks. Was that in one of the examples on the website?

BTW in my original replace line 1 with this -

1. HIterator<HDrawable> iter = pool.iterator();

The creators  provide these classes as both .pde and .java files and this will work with both but my first post only works with .pde version. If you ever want to use the .java then at least that is one change you won't have to make.

It doesn't actually, it has 3 methods- hasNext(), next(), and remove()

I believe that you're probably familiarized w/ object instantiations, am I right?
Any non-primitive variable needs to get a reference from an object before start using any methods from it.

It means as long as variable iter got no reference from a HIterator object,
none of its methods or fields can be used. Like hasNext() or next() for example.

Seems like you gotta grab that reference from some method of a HShape or HDrawable object though.
Look up for it in that library documentation.

Oh nice, I learned something! Haha... well I got it to instantiate properly- actually I noticed afterward that quarks had actually fixed the code but I didn't see it.

FYI You never instantiate an iterator object yourself. An iterator object is always created to work with a particular collection - it will not work another collection, even if it is the same type so assuming  HDrawablePool object is called pool then
 
HIterator<HDrawable> iter = pool.iterator();

The iterator() method will instantiate and return the iterator object. This iterator object will only work with the pool object.

Looking at the code the iter.remove() should remove an HDrawable object from pool I don't know why it didn't work for you.

I know! And I ran a simple check (incrementing a variable i and printing it out). The objects are no longer in the pool and yet, they remain on screen. I think there might be one final step to update the actual Pool, but without any documentation I can't figure it out. Anyway like I said it's just a grid layout, I've already finished making my own

You might try the size method to confirm the deletion i.e.

print("Was " + pool.size());
iter.remove();
println("  now is " + pool.size());