I use the envelopes that come inside for mailing--just cross out the addresses--but don't use them if they have paid postage.
We often get these coupons that come in packets that are only printed on one side. If they're 8 1/2 X 11, I use them as scrap paper for the printer. Smaller sizes I use for writing lists and notes. Any other junk mail that is blank on one side becomes scrap paper too (form letters, etc)
The fake credit cards are great for covering and making bookmarks, ATC, magnets,etc.
I've gotten some stuff that was fairly stiff like cardboard--fold out type stuff that's great to cover and turn into nifty little scrapbooks/memory books. Other stuff like dvd's advertising things or the cases they come in also make great memory keepers if you cover and decorate.
Magazines or catalogs are great to use as a mat for crafting--just tear off the used pages for clean work surface (great for kids painting!)
If anything comes with great pictures I save those and use instead of clip art. Or use to cover boxes of various sizes or as wrapping paper for small items.
Shred interesting colored papers (although white works) to use as filler inside baskets or other gifts.
Depending on the paper quality you can punch shapes and either use yourself or give to kids for fun (make up a baggie of them, a glue stick and a stack of paper would make a fun gift for a kid).
I've had the yellow hat fabric for years! Probably before she was born. Guessing it was for something I was going to do for one of her older sisters! LOL Wasn't sure what to do with it and just happen to see the dot fabric laying nearby and thought that's the combo! The dot fabric came from IKEA--leftover from a comforter I made one of the other girls.
I love that this pattern lets me play with fabric combos but it's not so fussy that I talk myself out of actually sewing.