I haven't had the chance to make these baubles into cards yet, but they are definitely on my list. I coloured them with copic markers and then added either silver or gold metallic ink to a few of the smaller areas for a bit of shine and sparkle. Glitter would also look good or some strategically placed rhinestones.
Feel free to use these pre-coloured images, but I would suggest that you go over the silver or gold parts with your own metallic pen to regain the shine that gets lost with the scanning and printing. Look to my previous post for the blank line drawing if you wish to colour your own.