eh, gratheo, there was no need to explain that anymore (they already ask for a reason...), but thanks for the explanations / examples. As a matter of fact I just forgot to mention what they represent... Oh well, here it comes.
The first and third flag represent a kingdom, Alirdyse or place of awakening, this land is trying to recover from a previous civil war that made the old republic fall apart. The first one includes red because of the bloodshed led by "brothers" against "brothers" so to say, the yellow (it should be gold) represents the sun, well, the two suns that take part of a binary solar system. Blue should represents their covenant, they would now choose a not-almighty king instead of a president or consul or dictator. White may mean peace but I'd prefer to let people think it's something to do with their "awakening". In the third flag the red stripe disappear as well as the reddish rectangle, this would mean that they emphasized the meaning of the big white stripe.
The second and forth flags represent another kingdom, Layse or place of the night. It also includes the New Geckoshire flag, a land that was recently annexed to the kingdom. Black stands for night, either natural or artificial due to the gas emissions coming out of the industries and forges. White would stand for pride, since its people are composed largely by smiths and engineers (showoffs), while black and red represents the Geckoan bloody past and the disaster caused by a plague they would never forget...