hey jen
have you done a googly search plenty of them to be found iam doing some myself some of the programs even lets you make puzzles of your own pics
(just not of astronomy)
http://www.google.com.au/search?hl=e...G=Search&meta=
jen
ive just bought this one for $25 AUS
realy worth it you can create your own ect ect just about any size as well from any pic you have
i used this one for starters it woll take me 8 hours to do (ouch) lol
http://www.inertiasoftware.com/jigsaw/downloads.php
regards john