I made this poster a few year ago from book I got from my mother-in-law (who found it at a garage sale). Here is a link to the book on AMAZON and better yet (!) a link to the FREE PDF of the book.
UPDATE - Apparently the PDF site is down. Luckily I downloaded it before it went down and I have it uploaded HERE.
I copied some of the templates from the book and made a "How to Make a Poster" poster (the kids think that is the funniest thing!).
I left it up on the wall and earlier finishers were directed to the poster to pick a layout to make a poster for the classroom on whatever topic we were covering at the time. This could also be used as a guide for a right hand poster assignment.
It currently resides in a friends classroom and she is using it in a similar fashion.