When it comes to Christmas presents it's never as easy as you might think, perhaps you know someone who is 'hard to buy for', which is what my wife often says about me! To be honest she is probably right.
I think it's especially difficult to buy presents for people that are in to photography though, because it can be a very expensive time if you're considering buying them a new camera or lens.
Why not consider giving them some photography tuition to help push their photography skills to the next level. I have gift vouchers and even presentation boxes that be purchased for most of the photography courses that I offer. Our new presentation boxes look great and feels much more like giving a gift than just a piece of paper.