I found these sites and I thought that they may be helpful for planning a birthday party. Even some of the baby shower ideas could be used for a birthday!
http://www.thepartydress.net/category/parties/
http://www.aestheticnest.com/search/label/party
http://www.thecakeblog.com/category/real-birthday
http://www.hostessblog.com/category/themes-occasions/baby-shower-ideas/