CorelDRAW X6 :: Creating Shapes Through Inverting Other Shapes

I drew something up on a sheet of paper, scanned it, then traced it's bitmap as line art. I then proceded to edit the vectors to recover all the detail I lost with the tracing. It took forever!

Now that I´m done, I realised there is a problem... how can I color in the drawing, if the lines themselves make up the shape? Essentially, I´m left with blank spaces in between all the lines instead of solid individual shapes that can be colored in.

What can I do? I´m so desperate I´m thinking of creating a gazillion individual shapes with the colors, and slapping them underneath the lines to "improv" a fill. But that will take waay too long, so is there an easier way?

If I could "invert" the shape I have now, so that the blank spaces become individual shapes, and the lines become blank spaces.