It's the current flag of ARMM:
And, looking for related flags, I found the flag of two Moro movements: the flag of Moro Islamic Liberation Front (MILF) and the Moro National Liberation Front (MNLF), the latter also the flag of the short-lived unrecognized Bangsamoro Republik (2013). The Moro people is the biggest Muslim minority of Philippines.
|Muslim Islamic Liberation Front||MNLF and Bangsamoro Republik|
I decided for a design that used common elements of three flags:
The crescent and star are present in the three flags, and is a common symbol of Islamism. The sword present on it is a kalis, a local variant of the kris or keris (a kind of dagger from Southeastern Asia), a wavy-blade dagger. Like on ARMM flag, the sword represent sovereignty and the will of defend the conquered autonomy; but, on my design, it's turned to the hoist on a more pacific attitude. The green color is associated with Islamism, and more neutral than red.
Comments and suggestions are welcome.
I'd like to thank my Facebook friend for the nice theme suggestion.