Today I'll show you how to add background to clip art.
Below is public domain clip art Santa Claus with toys from Clker by OCAL.
Then I added color #718ff3. Now it looks like this...
I imported image of Santa (above) and here it is...
I also made Santa Claus coloring page.
Santa Claus coloring page
I just replaced all fill colors with white (#fffffff) and outline color is black (#000000).