What do you call a person who enjoys doing jigsaw puzzles?

A Dissectologist!

The BCD, or Benevolent Confraternity of Dissectologist’s to give it it’s fuller title, is a Worldwide club for lovers of Jigsaw Puzzles from all Nationalities and time periods.

Recycle Old Jigsaw Puzzle Pieces: Craft a Wreath, Ornament or Picture Frame

Heres a novel way of finding a new use for those old jigsaws with missing bits - make them into a Christmas decoration or wreath.

Pieceless Jigsaws

These puzzles are made from single sheets of felt like material with a pattern cut into it like a jigsaw puzzle. The pieces, however, are not cut 100% so they stay attached in a single strand. In this way you can never lose a piece. The puzzle has a picture on both side - like having two puzzles in one.
They are perfect for traveling or while waiting (doctor's office, dentist, anywhere you end up sitting with nothing to do).
Take a look at this utube video for a close up look at the pieceless puzzle.