Here are some links to printable packs for tots, preschoolers and kindergartners. I've used these from time to time for some fun around holidays and just to liven things up a bit, when I need to give the kids something to do while I get a project done, and for extra skill practice.
http://www.3dinosaurs.com - a ridiculous amount of printables!!! (How do these people have time to come up with all of this???)
http://www.homeschoolshare.com/index_lapbooks_master_list.php - these are printable per say but are "lap books" mostly that go along with picture books. Just something to add variety.
http://www.first-school.ws - this is a site that has lots of themes and letter stuff. I’ve used it a lot!