Are you interested in spicing up your agile retrospectives and brainstorming about different exercises that you can do? Let share our experiences.
There's the book Getting Value out of Agile Retrospectives (https://leanpub.com/gettingvalueoutofagileretrospectives). As one of the book authors I can tell about the different exercises. And I can arrange a discount on the English and Dutch editions (https://leanpub.com/gettingvalueoutofagileretrospectives_NL). :-)