Costumes, decorating kits and more:
http://www.partybox.co.uk/themes.asp?theme=155
A "Chicago" style "he had it coming" divorce party:
http://www.associatedcontent.com/article/6112674/a_divorce_party_ inspired_by_the_movie.html?cat=40
Themes like Survivor, Lemons, Butterflies and more:
http://divorcepartyideas.com/divorce-party-ideas.htm