Gather your supplies. I am using: Catrice #590 'Jade is not my name', Catrice #410 'Pool party at night', Catrice top coat, Essence dotter and Essence nail polish corrector pencil.
Paint your nails with the blue and green nail polish.
Like this .
Drop a blob of the green colour on a piece of paper. Use dotter to dip into it and make dots on the blue nails.
Now drop a blob of the blue colour on a piece of paper. Use dotter to dip into it and make dots on the green nails.
When the dots dried well, start painting your nails with a top coat. Let this part dry very well!
Easy, classy and very vintage.