Look at the people on your blogroll. Enlist them all into each trading places with another on your blogroll for a day. For one day each of you posts on someone else’s blog – and you have to post on the same topics, and try to write in the same style as the author of the blog you adopted for a day.
I haven’t done it – I can’t write like the smart people on my blogroll.
If you try it, let me know!