I would have to say that after doing so much nail art on my clients, I feel it is more based on a particular mood.
If I am in a good mood I want something with more pizazz...if I want a classier look I will go with a french and add some lace to it or a few clear rhinestones.
If I want something in between a classy yet fun look I will go for a colored french, like mix a base color(from pink to purple or even red)and add a white french on the free edge(meaning the nail part to the top) then I would add more nail art like designs or i just add a sticker that is already done...if i really feel more creative I will do some form of 3d nail art...like a lady bug using acrylic then painting with the nail polish for the final touches. Top coat it. (for those that might have a UV curing machine, can always use some clear gel or sealer then cure it.) :P
royal purple with sparkles (it reminds me of outerspace) or bright, neon colors with SHATTER! nail polish. Most of the time I just use a pretty color that collaborates with my outfit for that day, add sparkles or SHATTER! nail polish and leave it on for about a week...:P
French Manicure, black with white tips, black layer underneath with a nice see-through red on top.
Pink with black zebra stripes.
Black and white french tips.
Black and white tuxedo nails.
black with red and white thorns. it sounds odd but its really cute
zebra stripes and royal purple with black polka dots
Marble, my parents used to own a nail salon.