Th flag of Uzbekistan has a blue, white and green stripe (in that order, top to bottom) separated by thin red stripes - quite unusual! Leave the moon and stars white.
Uzbekistan Flag Colouring Page
Here's a colouring flag of Oman to print for the kids. The central and left section is a bright red, while the crest stays white and the bottom section is green.
Here is a colouring page of the Bahrain flag, ready to be coloured in with its striking red and white design.