There are other hendecasyllabic meters, and the Lesbians did them first!
(Syllable notation: - is long, u is short, x is anceps - short or long as you see fit).
Sapphic hendecasyllable: - u - x - u u - u - x
Alcaic hendecasyllable: x - u - x - u u - u x
The most common meter I’ve seen in Greek verse composition books is the iambic trimeter, which is pretty flexible, but has sneaky parts of its own. I cannot give all the rules of that now (that’s a full essay), but a few notes might be interesting to people.
One iambic metron actually has two iambs, the first syllable of which group is anceps, so not just u-u-, but x-u-. Trimeter means three, so these are strung together. The last syllable of most verse forms is generally free, even when marked long. For the early iambographers, this is sufficient.
HOWEVER, as used in Attic drama, in certain positions a long syllable may resolve (break apart into two short syllables). One of those short syllables may combine with the neighbor short and contract into a long, switching your iamb around in funny ways. Here’s a schematic layout of the possibilities (in Tragedy; Comedy is even freer):
x - u - | x - u - | u - u -
u u u u u u | u u u u u u | u u u
- u u | - u u |
u u - | |
Now, this diagram indicates what can happen in each iamb position. I don’t want to suggest that once you start with a tribrach (u u u) you’re stuck with that for the rest of the line. But the last iamb is pretty sturdy, within the rule that the final syllable can be short but count as long by position (while you breathe in before starting the next line is the idea, apparently).
FINALLY, you have to put a caesura (a word end, often a break in sense or small, logical unit of phrasing) in one of two places. The caesura is marked with ||:
x - u - | x || - u - | x - u -
or
x - u - | x - u || - | x - u -
The caesura really does have to be a break. A prepositional phrase or an article shouldn’t cross your caesura, nor should an enclitic be leaning on a word across the caesura.
That might have been more than people wanted to know.
But I find this all interesting.