You can use at least 2 different colors to create ombré effect and also use so many colors you want. However, the color palette of your choice need to be as natural as it's possible. I choose pastel purple, pastel pink, hot pink, dark pink and glitter topcoat with glitters. Clear nail polish is really needed and also prepare sponge or tissue. I used clear tissue because I couldn't find any sponge at home. I'm going to buy marble kit with sponges in the future.
I painted this nail with my left hand (I'm right-handed) and I did my gradient manicure at the first time, so please forgive me if it's not perfect. Despite of this, I think it's super easy method and I completely keep up doing gradient nails in the future.
Step by step tutorial: