For commuters in some Chinese cities, metro card is something they can't live without. The smart cards are usually the same size as a credit card or an ID card. However, these pocket-size passes can be transformed into something imaginative and artful as well. /VCG Photo

The metro company in Xi'an, capital of northwest China's Shaanxi Province, has recently launched a new kind of metro card – in the shape of an imperial jade seal. /VCG Photo

The imperial jade seal, called "Yuxi" in Chinese, represents the highest power in ancient China. /VCG Photo

Apart from Xi'an, the smart card can be used for public transportation on buses and subways in more than 200 cities. /VCG Photo