I think it is good nail art method for beginners. You can create any rich background using different color varnishes, after draw flowers.

You need:
Green varnish
Golden varnish
Pink varnish
Black acrylic paint
Thin brush
Top coat

To draw such roses or any other flowers you like, you need to create colorful background. Add green varnish at the tip of the nail, than golden varnish. Apply them slantwise. For flowers - make three touches with pink varnish. Now we need black acrylic paint and thin brush to draw flowers. Finish with top coat.

To create similar pictures on the all nails you need to create background for all. For example apply green varnish for five nails, then golden for five, then pink. After that you can draw flowers. The same way for the other hand.