All these images are free to print out and use.
Santa:
http://www.dimensionsofwonder.com/christmas-coloring-pages-printables-santa/
I like the look of this Santa but it does have a few odd blacked in areas that I hope you can incorporate well into your work.
Ornament:
http://blog.educationalinsights.com/more-lets-doodle-coloring-pages/
From Let's Doodle, a variety of coloring pages together on one page. These seem to be hand drawn doodles.
Christmas Tree:
https://www.pinterest.com/pin/386465211753389589/
I can't find the original post to this beautiful image, but here is the link to it on Pinterest.
Merry Christmas:
http://sendikodawuh.xyz/christmas-pictures-to-color/christmas-coloring-pages-for-adults/
Simple in it's design, I know you can color it with enough detail, value and depth to make it beautiful.
Gingerbread House:
http://www.coloringpages1001.com/coloring-pages/christmas/coloring-pages/christmas-coloring-pages-2.gif
Not specifically for adults but detailed enough for you to enjoy.
Mandala:
http://joglokids.net/detailed-christmas-coloring-pages/coloring-pages-16/
While not specifically Christmas, it reminded me of a stained glass church window.
Small Town:
http://www.activityvillage.co.uk/festive-street-colouring-page
Christmas movies are always centered around a small town or village, here is a cute one to color.
Candy Canes:
http://www.doverpublications.com/zb/samples/479366/children47a.htm
Dover offers a variety of different art books for printing, coloring, collage and more. Each week they offer a few pages for free. Join their email list to continue to receive notifications of what is available.
Candles:
http://www.doverpublications.com/zb/samples/471950/children20a.htm
Another offer from Dover.
Now What?
What do you do when the coloring page is finished? Well, you could easily frame it. How about taking a picture of it and send it to be printed out smaller for use in a greeting card or postcard. Consider cutting off the extra white paper and wrapping it around a white pillar candle, use a blow dryer on it to melt the wax into the drawing for a very one of a kind candle. You could do a similar thing with a glass pillar vase, just use Mod Podge to adhere it to the glass. Photo copy it onto iron on transfer paper and turn your artwork into a throw pillow or tote bag. If you are really handy with a sewing machine, you could transfer the images onto fabric and create an entire quilt - how beautiful.
