This happens when there is a malfunction in computer prossesing. Club Penguin, like all computer games are not perfect. Or, It could be someone hacked your account.
Blue with yellow give green.
Purple! Have a close look at the colour wheel. Let me explain what the colour wheel is. The colour wheel is all about the Primary Colours (colours you cannot make with other colours). The Primary Colours are Blue, Yellow and Red. Blue + Red = Purple Red + Yellow = Orange Yellow + Blue = Green Purple, Orange and Green are known as Secondary Colours. There are also colours that compliment each other in the colour wheel. If you have a look at a colour wheel and choose a colour, then see what colour is OPPOSITE the colour you chose, you find it's Complimentary Colour!
yellow and blue.
yellow
Mixing yellow and blue will result in green, in relation to the percent of mixture of the two colour.
When blue and yellow are combined, you get the color green.
A penguins body is black and white. They have orange and black beaks and black scales on their webbed feet.
Blue and Yellow are both primary colours. When you mix equal parts yellow and blue you get the secondary colour Green. When mixing green you can vary the colour by varying the amount of blue for a darker green and yellow for a brighter green.
blue with white clouds
green
Green
Green.