Here's some good model student work for some metas:
For example, look at Ashley's insight (with detailed specifics that refer to the book) for each song on her "soundtrack."
Jenny does the same thing; her meta is not by song, but is more of a personal-prose-reflection. Both are well done. Pick a style that works for you--but please make sure the quality and depth remains.
Also, here are some nice covers with links to metas from