I cannot help myself. I have pinned almost 2,000 items. I don't want to keep all these pins to myself, so here are some links to some Pinterest boards that you might could use, too.
General Classroom Ideas
Neat Bulletin Board and Door Decor Ideas
iPads in Education
100th Day Activities
Winter Books and Activities
Valentines Books and Activites
And this isn't even half of all the boards I've started. Yes, I am a Pinterest addict.
If you're not currently using Pinterest, what are you waiting for? One word or warning, though. Pinterest is addictive. You may find yourself browsing and "pinning" for hours, but it is sooooo much fun! Hope you find something you can use.