It's the old memory cards game but now a team game for IWB. The class is divided into two teams. The teams must hunt for pairs of matching items by revealing just two squares at a time. Download this free PowerPoint template which is easy to edit for use in any classroom.
http://www.myinteractiveclassroom.com.au/products/memory-squares/memory-...

This is one of many creative interactive activities available from John Short's wonderful website:
http://www.myinteractiveclassroom.com/