"Shabby chic" a relatively new phrase used to describe room designs is an obscure blend of neglect and style. It is one of the most difficult bathroom designs to create and it takes a bold decision to go for this bathroom style. It almost certainly achieves its full potential in a continental house either a French chateau or old Spanish villa.
When decorating a traditional bathroom both soft tones and bold colours can work well. Strong tones of browns maroons and greens give a nice warmth to the room but be sure the bathroom is well lit maybe with a lavish chandelier. With the right colours antique gold can look better than chrome. Go for curtains never blinds. If going for a vanity unit rather than a traditional basin and pedestal choose an oak or cherry finish; or the white Cynk vanity unit is a good look with traditional baths and toilets.
Colours. There are unlimited colours to pick from too with bathroom basins so take your time to find one you really like. There is no right or wrong choice so find something that works well for the look you wish to portray in your bathroom. This is a change that can be part of a huge remodel or it can be the only part of that room you plan to change.