Liechtenstein's flag is blue in the top half and red in the bottom half. There is also a yellow/gold crown in the blue part.
The flag is divided horizontally into two. The top half is white and the bottom half is red.
By the sounds of it, if the black is on top and red on bottom, it is the Australian sub-national flag of the Aboriginal Peoples'.
Saudi Arabia
Greenland, perhaps.
The welsh flag is green on the bottom half and white on the top half. A red dragon that faces to the left is placed in the centre of the flag. Please see the related link.
The bottom half of Singapores flag is white, and the top half is red. On the top half there is a moon '(' and right next to the moon on the right are five stars in a 'pentagon' shape.
The colours of the Polish flag are red and white. The flag is half red and half white, divided horizontally. In the top half, which is white, there is a red crest with a white bird in it.
The three diagonal stripes on a Union Jack consist of a broad white stripe, a medium red stripe, and a narrow white stripe. The bottom half of the Union Jack should have the broad white diagonal stripe nearest to the flagpole, if the bottom half of the flag has the narrow white diagonal stripe nearest the flagpole, the flag is upside down. If you look at the Union Jack on the following link (See Sources and Related Links), the flagpole would be on the left hand side of the flag.
half of it
The flag of Ukrain features 2 colored bars on top of one another. The top bar is blue and the bottom bar is yellow. Blue represents the color of the sky and yellow the color of the wheat fields.
Green across the bottom half, white across the top half and a large Red Dragon placed at its centre