A lick of chalk paint and some embellishments or stencil work will do the trick. Chalk paint comes in a variety of colours and Chalk and Cheese have these for sale at their shop at 22 Mills Street Strand. The beauty of using chalk paint is that there is so little preparation needed.  If you aren’t sure of what to do then either Cathy or Zelda are always willing to help. They also hold regular workshops. There are also plenty of examples to look at in the shop.