For our first talk for writing project we used
Beauty and the Beast 
by Geraldine McCaughrean. This is a beautiful retelling with dream-like illustrations. The language is incredibly rich with poetic word order, e.g. 'Into a forest of fifty thousand trees rode a lone traveller.' The sentences are replete with detail and offer great variation in openings.
Whe working with Heads and Literacy subject leaders we used Blue John which is unfortunately now out of print. For our latest project we are using
Think of an Eel 
an amazing non-ficiton book about eels told through two voices. Voice one is that of literary non-fiction being very poetic and the second voice that of a more formal report. The difference between the two is well worth exploring with children and looking at how they can imitate and innovate upon the voices.