Light blue (abbreviated "LBlue") is one of the great power colors in Imperialism and Imperialism 2.
In Imperialism its standard name on a random map is Haxaco. In Europe scenarios it is usually the Russian Empire, but Pan-Germanism 1815 gives it to Switzerland, while Ancient Greece gives it to Thessaly.
In Imperialism 2 it is always Sweden. Tiles in the New World may eventually display "Light Blue Purchase Flag" among their attributes.