http://www.blacklinemasters.net/category/maps (color to match your puzzles)
http://www.blacklinemasters.net/category/math (some great grids here)
http://www.blacklinemasters.net/category/flags (for geography work)
http://math.about.com/od/addingsubtracting/ss/Adding20.htm (computation...
theses make great extensions)
(American history and geography...I'd use these to make matching cards etc.)
(learning games)
http://www.abcschoolhouse.com/index.html (this site has free pre-views
of their purchased materials for free download...lots of cute pix here)
(christian blacklines...good for making cards, story booklets or just for coloring)
(the math and geometry motherload!)
http://printables.atozteacherstuff.com/645/pumpkins-printables-and-worksheets/ (in honor of the fall season...many pumpkin themed activites)
http://printables.atozteacherstuff.com/ (more of their offerings)
Enjoy!