I'm preparing for Talia's birthday party and I wanted to try making a paper triangle banner (is there a technical word for that? I'm answering this myself- I looked it up. Bunting.) instead of using streamers this time. I pulled out the ol' scrapbooking paper and here's what I came up with:
If you've got 12x12 paper, you can use the same method I did
(I've posted a Tutorial Here).
If not, and if it doesn't matter whether the paper looks nice on both sides, you can use this idea from The Magic Onions blog.
I used 6 different pieces of paper & got enough triangles to make 4 (double sided) triangles per pattern. This makes a pretty long banner.