Now you've practised hard and are happy with your white work, it's time to throw a spanner in the works and add some colour ;-)
As I've said previously, DON'T go and spend loads of money on paints, inks, pencils etc. until you are sure this is what you want to do.
Raid your child's/grandchild's/neighbours child's pencil case or go to a charity shop and grab yourself some ordinary colouring pencils/water based felt tip pens (don't use alcohol markers e.g. promarkers - they bleed into the paper).
Again it's a case of practising on some scrap parchment/tracing paper.
It's up to you whether you colour on the front or the back; before or after embossing.
Whatever gives you a pleasing result is best (and you can mix and match).
So go on: be bold and give it a go :-)
Here are some examples of adding just a touch of colour;
see how different the first two cards look - they are the same pattern.