these are chinese paper cutting designs of cranes, one of the animal symbols for longevity
these are also chinese paper cutting designs of '寿' which means longevity.
here's some more intersting facts about chinese birthdays, did you know that 'Fu Lu Shou' (traditional chinese : 福祿壽; simplified Chinese: 福禄寿) refers to the concept of Good Fortune (Fu), Prosperity (Lu), and Longevity (Shou). This Taoist concept is thought to date back to the Ming Dynasty, when the Fu Star, Lu Star and Shou Star were considered to be personified deities of these attributes respectively. The term is commonly used in Chinese culture to denote the three attributes of a good life and are usual icons seen during chinese birthday and anniversaries.
(For more info about 'Fu Lu Shou', go to http://en.wikipedia.org/wiki/Fu_Lu_Shou )