I need Ideas on how you have used left-over wallpaper border.

Use as a liner on small drawers. Decorate cigar boxes (which can be purchased for $1.00 at cigar stores.

To be very honest, if you have it up a wall I would not use it anywhere else or in any other capacity because it will make the original look of the wall look well for a lack of a better word,cheap. If you put it up its because you were creating a look, so why take away from that by now using what is left. But if you found it at a rock bottom price and bought it because you want to add interest then I would cover storage boxes with it, I would have about three boxes that get larger in size to make an impact in the room you place all three stacked together or in same bookcase, in fact you might be able to cover old books with it and place them throughout your bookcase to add interest.

I use left over wallpaper to wrap gifts, decorate boxes and reface dresser drawers/liners inside of drawers. I also use it for crafting.

Decorated outside of a box - A Lampshade - On wall around a Mirror -

Around Picture Frame - Around Outside of Ceiling - Around Light Switches.

Donate to a local elementary school, especially one is a less advantaged area. Teachers can always use materials such as left over wallpaper for doing up bulletin boards, and teaching crafts.