This is an interesting colouring in flag belonging to Kyrgyzstan. The background is red and the sun shape is yellow. The cross design in the middle represents the traditional Kyrgyz yurt (a kind of tent).
Kyrgyzstan Colouring Flag
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.