The blue flag was not colonial. It was created for Independence by Mohammed Awale Liban in 1954 and represents the geographic divisions of the Somali People. The first link below the quotes is especially interesting.
en.wikipedia.org
"The
flag of Somalia (
Somali:
Calanka Soomaaliyaa,
Arabic: علم الصومال), also known as the
Somali flag, was adopted on October 12, 1954 and was designed by
Mohammed Awale Liban. The flag was used for the nascent
Somali Republic. It was originally conceived and serves as the ethnic
flag for the
Somali people.
[1]"
"The flag of Somalia was created in 1954 during the transitional
trusteeship period of the nation's history. It was personally designed by the Somali scholar
Mohammed Awale Liban, Who was from the northern eastern side of Somalia (Puntland) after being selected to come up with a design in preparation for
Independence Day[2][3] The flag was first used in the short-lived independent
State of Somaliland "
"As an
ethnic flag, the five-pointed white
Star of Unity in its center represents the areas where the
Somali ethnic group has traditionally resided, namely
Djibouti,
Somaliland (former British protectorate), the
Ogaden region in
Ethiopia, the
North Eastern Province in
Kenya, and southern Somalia (former Italian colony).
[4][5] However, it now officially denotes the sky as well as the
Gulf of Aden,
Guardafui Channel and the Somali Sea, which flank the country.
[6] "
The National Flag of Somalia is rectangular shaped and features a light blue background with a large white five-pointed star ("Star of Unity") in the center; the country uses Somali shilling as its official currency; and its national anthem is Qolobaa Calankeed ("Any Nation's Flag")
www.worldatlas.com
National flag consisting of a light blue field with a central white star. It has a width-to-length ratio of 2 to 3.Beginning in the mid-19th century, areas in the Horn of Africa populated by Somalis were divided among Ethiopia, France, Britain, and Italy. Following World War II, the former Italian
www.britannica.com