Bloody Mary makes a great white mascara about $18 and Ben Nye makes one about $9, Kryolan makes a cake mascara in Ivory more of a blond than white, and here are several yellow eyeliners in gel and liquids. Medusa makes a good gel liner, they have a yellow about $15 and Mac makes one about $19. You could also use Mehron's Paradise Detailz yellow at about $7.
Mascara and gel liners come in lots of colors. It just a hunting process sometimes.
We have used face paint on our mascara wands for a very temporary color, not sure I'd recommend that for a long day of play. Best to use makeup s it is intended.