I think it's more fun to paint my nails when they are long and that's probably because I really like to do some kind of design with a french tip involved.
I have used a random old sheer silver glitter on the whole nail and two layers of a white polish from e.l.f. to do the french tip. For the lines, that remind me of seaweed, I have used acrylic paint. Then a few light purple rhinestones to add something more and finish the design.