Any Ideas?

Now, I know there are some really talented people with imagination who read this blog.  Have you any suggestions as to what I can make with these?

Sorry the pic's side-on - I don't know why it's done that.

I found a skip full of them while walking the dog this evening.

My first thought was, as always, bookshelves (I must tell you about my Grand Winter Project), but I could also make something useful in the Shed (a rake tidy?).  What else?  Unless I can think of something good, I'm not allowed to go and get more.

In the last resort it's free firewood.

Edit

Here's a better picture.  I'd thought leaning them on the chair would give a sense of scale, but that was obviously spoilt by having the pic on its side...