As colouring in a white kite isn't very easy, you might want to get the children to draw something that is mostly white - a snowman, icicle, snowflake, fridge - on this kite colouring page.
Kids can colour this kite yellow and put it on display. Alternatively, print onto card and cut out. Ask the children to colour the word yellow and find a picture of something yellow in a magazine to cut out and stick beneath the word.