Another fun idea for us LF users -- use the film inserts for plate holders. Mount on wall with the sticky-puddy.
When using the foam core idea, cut the edges of the foam core at a 45 degree angle so that the tag 'floats' on the wall.
Another way for small labels -- print on card stock and glue a much smaller piece of foam core on the back. This will float the label, also.
Kinda of nice, really. Lets folks see the piece before being influenced by the label.This subject amuses me, as a few years ago it suddenly seemed trendy to have the tag/label miles away from the actual picture. What was going on?