If you just google the topic, you�ll get loads of ideas:
http://www.azargrammar.com/assets/fwg/FWGChapter07.pdf
http://grammar.yourdictionary.com/parts-of-speech/pronouns/pronoun-games.html
http://englishwithjennifer.wordpress.com/2012/07/18/whose-is-it-an-activity-to-practice-possessive-pronouns/
http://www.teachingenglish.org.uk/forum-topic/possesive-pronouns
http://www.eslhq.com/worksheets/preview_worksheet.php?worksheet_id=123700
http://genkienglish.net/whoseisit.htm
http://www.superduperinc.com/handouts/pdf/173%20teaching%20pronouns.pdf