I know someone who though now grown up, still likes to colour in.
I found and pinned a site with lots of links for free printable adult (as in complex patterns and intricate design, all "G" rated) colouring in designs.
I have chosen about ten pages and printed them and put them together for her very own colouring book.
There are complex Celtic designs, mandalas and angels and Christmas scenes.
Obviously she is not the only one with this penchant with literally hundreds of images to choose from.
Here is the link to the page of adult/teen colouring pages.
If you want to see what else I have pinned under "gift ideas" and maybe get some inspiration click here or on the pintrest tab at the top of the page.
Hope your gift list is coming together. Mine has taken a bit of a break. I went to sew up some children's aprons yesterday morning and the sewing machine is dead as a doornail. The man is hoping to have it back to me by tomorrow afternoon, fingers crossed.