13 Ideas for a 31st Birthday Party 2016. Your thirties are all about celebrating who you are, and when it comes to throwing a party, you know the drill: First you pick your theme (preppy, nerdy chic, nautical DIY these spray painted vases and pick up a pink bouquet and feathers at the craft store to make them unique. 13 Ideas for a 31st Birthday Party Please note: You are currently browsing img mad hatter tea party that is 600x847px in size. This image is listed in diy garden party decoration ideas category. 13 Ideas for a Bangin BohoInspired 31st Birthday Party, 600x847 in 192.17 KB.