Updo all the way
Not only is it practical at work to have your hair out of your face, but it's also a sneaky way to hide hair that needs a wash, or is simply misbehaving (well, it is Monday after all). Throw on a pretty, seasonal head piece like this sparkly example, pull a few wisps loose, and you'll have an ethereal, fairytale style that's perfect for the office and for a made-it-through-Monday celebration afterwards!
Blow-drying your hair upside down will give you the natural volume you need for a statement updo.
Keep it down
Show the week who's boss with loose, carefree waves. Use a curling iron on small sections to create natural-looking waves, then spritz with holding spray to make sure they don't drop (if they don't, you won't !) This style brings a touch of attitude to your presence - time for a promotion maybe?
Curling sections of around 3cm/1 inch for a few seconds each will give the impression you have natural waves.