A - Red, because apples are red and apples starts with A.
F - Grey, because fish are grey and fish starts with F.
Y - Yellow, because the color yellow starts with Y.
U - Blue, because of rain and you cover yourself from the rain with an Umbrella - which starts with U.
X - Half dark blue, half light blue - because those are the colors of an X-ray.
P - Pink, because pink starts with P.
O - Orange, because orange starts with O.
T - Brown, because their Alpha-friend in class for T is Tikki Tiger and Tikki Tiger is brown.
S - Yellow, because it's the color of the Sun, which starts with S.
W - Blue, because water and whales are blue.
His mind never ceases to amaze me.