It's always a bit tricky to glam up your makeup during that frantic after work/pre-going out moments. I've tried everything (and failed several times) until I realized that updating your eyeshadow is the key. And it isn't as hard as it may sound--especially with a palette that has all the right colors for both looks like Kevyn Aucoin's Essential Eye Shadow Palette in #6 ($55). This kit really have everything you need for an entire day of fab lookin' eyes.
In the morning, start off by applying an eye shadow base (or do what I do and apply a light layer of concealer to your eyelid). Next, brush the lightest blue shade (top left) over your entire lid--from lashes to brow. Apply the shade beneath it (light grey-green) only on your lash line and outer corner of your eye. This is a pastel smokey eye. Add a swipe of mascara, a pinch of blush, and maybe some lip gloss and you're set for work.
When 5pm comes around, you can brush on either the royal purple shade, or the blue/black shade (depending on how daring you are) as an eyeliner for the top lid only. You can get as crazy as you want, or keep it simple. Either way, it will pump up your look from day to night with little effort and it won't ruin your day makeup--it will merely enhance it. Not bad, huh?