Paper clips, thumb tacks, paper fasteners, pens, pencils, safety pins, twist ties, rubber band, etc. You will be surprised and amazed at how much you will accumulate once you put your mind to saving. For your paper products, use a box that is big enough for paper that's been used on one side. Check your mail everyday for one sided printed paper. You can reuse the envelopes that were intended for return mail.
Many organizations send greeting cards and address labels.
Save them and reuse them. Save and reuse the giant manila envelopes you get in the mail. The true key to success of this project is to find a special place to set up your Stationery Supply Station. Rubber Band Balls Crumble up a piece of paper and wrap a rubber band around it. As you collect rubber bands, wrap them around the paper until you have covered the paper.