我只能例舉一些我有的=.=

星空：

http://steamcommunity.com/market/listings/753/96100-Space%202

http://steamcommunity.com/market/listings/753/298520-Orbital%20Gear%20Space ←不便宜

其他一些藍色色調的背景：

http://steamcommunity.com/market/listings/753/327410-Over%20the%20Desert

http://steamcommunity.com/market/listings/753/297100-Beyond%20Space

http://steamcommunity.com/market/listings/753/223220-Giana"s%20Room%20-%20Night%20Time

http://steamcommunity.com/market/listings/753/262260-Coffinator%205000%20(Profile%20Background)

http://steamcommunity.com/market/listings/753/292380-Rally%20Alpine%20-%20Night

http://steamcommunity.com/market/listings/753/201570-Engine

http://steamcommunity.com/market/listings/753/210770-The%20Wilderness