Definition posters of abstract and concrete nouns. Collection of abstract nouns for cutting and displaying around either the definitions or the children's poems. Instructions for writing abstract noun poetry.
I read examples of poetry (written by previous classes) to the children before setting them the task of writing their own. Encourage creative thinking and you should get some great ideas from the children.
I used this with upper KS2, but it could be used with KS3 pupils too.