Sure. I'll have to rely on some stuff that I'm not entirely finished with, though, so anything I don't link to should be regarded as just a sketch.
This poem has partially ABAB, in the middle verses, to be exact, but most particularly noticeable in verse 3.
AABB would be more like (note that this song, of will I'll only post a fragment, definitely is a work- in- progress)
"You were swallowed
by a wave out of the blue;
a wave of nothingness consumed you,
leaving me left behind
to the tormenting thoughts of an empty mind.
My laments rise up to the sky
so passionate even the moon wonders why.
Will I ever feel the comfort of your embrace
or see some tenderness on your hard face?"
With the exception of the first line, this is all purely AABB. Using this form is perfectly alright, but often it is a good idea not to make it too darned obvious, like so (AABB starting from fifth line. This is a dark cabaret style piece I'm working on.):
"...so afraid of loosing him and
... I don't seem to be enough for him.
Will he leave me?
I'll dress up again 'cus he'd like me to,
I'll wear all the jewels he bought in June
I'll not seem desperate, not today
and put on a mask and let it stay that way
The day is perfect, and hey -
I'll find you anyway."
There's more to that one, but I think I've illustrated my point. The other reason I post this excerpt is to try to show you how important a strong rhythm is in a piece of lyrics. It is really essential. This piece has a very particularly noticeable rhythm, as you might have noticed, even though it is unfinished and is lacking in many areas. If you've got a good flow and a strong rhythm, you really don't _need_ rhymes, strictly speaking, although the odd one here and there tends to make the piece seem a little more whole and complete. If you'd like more examples on this, or mixed rhythm stuff or so that I've written, I've got a collection up on my website,
The Drawing Room. The reason I post my own pieces, by the way, is because I know these intimately, and thus know the exact composition of them. It's not like they're masterpieces or anything.