sorry for the stupid quality, its because i did my nails BEFORE i decided to do a tutorial, so you will get a tutorial thats actually done on paint and thoes are NOT my nails xD

1. you need:
 white nail polish,
red nail polish
blue nail polish.

now, i only have one nail polish art-pencil. so after i've used it, i just clean it up with nail polish remover, and then i can  use it for another color.
if you dont have an art-pencil, then you can use a toothpick:

but it will be A LOT harder if you choose do do it with a toothpick.

so you beguin with the foundation. This time its white.

1.

    then you beguin with the red nail polish. for that you now need the art pencil or a toothpick.
    you do a doubble stripe on the cross in the middle, because its supposed to be a bit thicker then the  other
    ones.
2. (i know, super quality! xD)



    then you just add the diagonal cross, but it should be a bit thiner now.

3.


   and the last step is to fill in with the blue. for that one you also need an art- pencill. but dont paint over all   the white- leave some small white stripes between the red and blue, its supposed to be like that. ;)

4.  okay, now that was a horrible picture, but i think you get the idea? i hope so, aat least, and if you read the instructions you should get it, its really not so hard :P

that was all, hope u like it! ;)