My brand of choice has always been OPI and I love reading their seasonal colour tips:
This coming Spring everything is short and green!
Nail shape for 2010 is squoval, not square and not oval – squoval.
Shrek Forever After
The 2010 “Colour of the Year” is a beautiful tropical turquoise.
The turquoise of spring and summer is complemented by violet, to add a sense of romance.