I've always been a big fan of simple grammar games that can be used in YL classrooms with minimal preparation and focus on using clear grammar patterns for realistic and practical speaking tasks.
I use them in two ways or directions: (1) pre-planned as part of a (build up to a) specific communicative activity, and (2) on the spot as a particular grammar point becomes more salient through various other activities.
They are actually simpler to design and apply than many teachers imagine, and they still focus predominantly on having learners express themselves and improve both their accuracy and awareness of grammar while communicating something. In addition, they also make good use of game-like rules and parameters, to keep learners motivated and energetic with them.
Here's an example from one of my Activity and Resource Kits on English Raven:
That particular kit has 55 different grammar games listed, described and exemplified. It is available as an e-book download for English Raven Members, along with the rest of the huge stash of materials on the site.
You can also order it as a single unified file to be delivered in e-book (PDF) format directly to your email account, for just US$ 5.00!
:-D
