If you are fascinated by the idea of Ombre nails, getting the design right is very important. Check http://www.msmee.com/ where you can find many nail art designs for this trend. The first step is to clean your nails and get the clear base coat done. Next, pick a solid color that serves as the base for the main effect. Ombre means shaded. To get that effect of transition, you need a beauty blender. Create three different lines and fill the gaps with colors that you want. Usually, a transition from light to dark looks better.
Next, just the use the sponge and transfer the three shades to your nails. The sponge will create the Ombre effect, although you may need to work around with the sponge for a while to get the right look. You can use rhinestones of glitter if you want, but once the design is done, seal everything with a clear top coat.