A look I've recently been loving is berry/deep red lips. It's perfect for the season and it's the easiest way to look quickly polished and a bit more 'dressed up'. I find it so handy to have this little look up my sleeve when I have about 30 seconds to get from work to wherever I'm heading in the evening.
My current go-to product for this look is one of the Revlon Lip Stains - the shade 'Crush' (you can see it swatched along side the other Lip Stains here) - it's easy to apply, even if I'm trying to do so when precariously balanced on a busy tube.
What I love about this particular balm stain is that it's pigmented and once applied can pretty much be forgotten about. The shade lasts really well - it will need re-applying if there's a fair amount of eating/drinking - but generally this will last all night without the need to retouch.
What are you thinking of deep berry lips?!