These colours have these 'smell' associations [I think so, anyways. They're from my glitter pen collection]:
Dark Blue: Blueberry
Blue: Soap/freshly washed clothes drying on a line [mmm ...]
Dark Green: Melon
Light Green: Lime? I'm not too sure ...
Orange: Orange. Duh!
Brown: Chocolate [I was pleasantly surprised to find this out]
Pink: Candy Floss!
Black: Liquorice [and it honestly smelled like it too!]
Why does Silver smell of Watermelon? I really don't see the connection. Probably the makers couldn't come up with a silvery smell. Can you think of any?!