I wonder if Blutack would stain the paint on the door??
I was going to suggest (though it might be costly) some of those removable tab things that come with hooks but just using the tab things ??
Permanent fixture - liquid nails!! or another strong hold type of glue.
You can get the 3M Command strips which the other's are talking about in an almost velcro like thing (but better than velcro). I've used it to hang a couple of canvas pictures in DD's room and it works great.
Bookmarks