I mentioned before that J is not that great at 'breaking the rules', and while that's commendable for most things, a little experimentation is a good thing.
We've done quite a bit of work on the great inventions/discovers of the world (Fleming, The Wright bros etc) as a prelude to this, and talked about how some inventions happened from just trying a different approach.
To help with this I bought a few books (okay all of them) by Keri Smith - I can't recommend her enough. We've started with 'Wreck this journal'. Essentially the idea is that you use the book for all the things you're not supposed to use books for... Initially J wasn't convinced, but then he realised that sometimes these things can be fun too..!
So far he's made muddy footprints in the book, scribbled madly, made finger paint marks (this was revolutionary for a child that doesn't like touching paint or paint on him) and even tried chewing paper (another ridiculously amazing breakthrough).. amongst other things.
Another book we've started is a pocket scavenger hunt, we look for everyday objects, like a stamp or a paper clip, and then make up a story about where it might have come from etc.. Great for using imagination.
I cannot praise the author of these books enough. And would thoroughly recommend them to anyone, but especially to children that can have a certain 'rigidity' to what they do, or have a strong reluctance to try new things.