[HarryT]

Originally Posted by xibalban

A guide on choosing a more interesting metrical pattern would be nice. Do you have any guide ebooks to suggest?

Guidebooks? No. Just look at other poetry and see what other poets do. One of my favourite poets is Rudyard Kipling, and he uses all sorts of different rhyming patterns. Eg:

God of our fathers, known of old,
   Lord of our far-flung battle-line,
Beneath whose awful Hand we hold
   Dominion over palm and pine—
Lord God of Hosts, be with us yet,
Lest we forget—lest we forget!

Here we have line 1 and line 3 rhyming, and line 2 and line 4 rhyming, with a final rhyming couplet.

Or:

 You may talk o' gin and beer
When you're quartered safe out 'ere,
An' you're sent to penny-fights an' Aldershot it;
But when it comes to slaughter
You will do your work on water,
An' you'll lick the bloomin' boots of 'im that's got it.

Here lines 1 and 2 rhyme, and lines 4 and 5 rhyme, but line 3 rhymes with line 6.

Both of these are much more interesting to read than a simple succession of rhyming couplets.