So far Lojbanic literary efforts have been limited to a handful of users, & most of the texts produced have been translated from English & other languages.
An early proposal to write Lojban in Old Norse verse forms did not bear much fruit, though the idea itself remains fascinating (& perhaps stands for a ne plus ultra of Lojbanic competance?).
Several people have written sonnets in iambic pentameter, as well as rhyming songs.
There are also others prefering jbopemci without endrhymes, e.g.:
The Lojban limerick at one time had a vogue. See doi dirba, nu porpi lo ckana.
An abbreviated "novel" (cfika dekpu 'fiction gallon') by Michael Helsem exists, lapoi pelxu ku'o trajynobli; & within its labyrinthine coils are a couple of kakpa draci ('digger drama') or "Mole Plays".
An all-vowel poemform (rolkemvaxysna pemci) by kreig.daniyl. may be seen under LojbanPoem. As even that example illustrates, it's not actually all vowels; just all attitudinals. The idea is to precisely define an emotion with a few lines of attitudinal indicators. Also, I frankly don't think rolkemvaxysna pemci sounds very good (plus I consider tanru more lobykai) and would prefer selcinmo pemci instead. - la kreig.daniyl.
The "spicy tanru" seltsapytau (see: http://groups.yahoo.com/group/lojban/message/1789) has been proposed: throwing together gismu into arbitrary combinations & then trying to understand the results. (Doubtless this influenced the phrase xazdo stagi in la luryri'e.)
Riddles, te smadi ('thing-guessed about'), have also been written. (See:
"Three riddles": http://groups.yahoo.com/group/lojban/message/1231 & ff)
Palindromes have also been written.
Creating lujvo according to special patterns, is also a minor artform.
Don't those really mean powerful words and complicated lujvo? (Yes, but the names needed to be paradigmatic...)
To forestall any potential confusion; Lojban does not have contrastive vowel length, so it does not, and shall not, have quantitative metre.
Insofar as having a meaning for every sumti position of a gismu is considered essential to its integrity as a semantic unit, it has been pointed out that until a Lojban poem lojbo pemci actually has a poetry-audience ve pemci, it might better be referred to as a valsi morna 'word-arrangement'. Carrying this distinction further, some poets call themselves pemcypra 'poem-producer', rather than te pemci. 'Despite the fact that we don't produce pemci until there is a ve pemci?'
pemci pem poem x1 is a poem/verse about plot/theme/subject/pattern x2 by author x3 for intended audience x4
Don't think there is any need for a {ca'a ve pemci} to be a {te pemci}, since x4 is just an *intended* audience (most poets write for an intended audience - at least for themselves).
"How to write Lojban Poetry" has some good ideas: http://people.fix.no/arj/lojban/poetry.html
See also "Issues of Lojbanic Scansion" here.