I made these ones in a traditional triangular shape. The last ones I made were from leftovers from a patchwork quilt so they were square, which I think I like better.

So, I chose 4 complementary fabrics that wouldn't date too quickly....

and made a cardboard template...

This one is approx 16cm across the top and the longer sides are 20cm but you can choose whatever size you want.
Then I used the template to draw on the fabric. Using spots and stripes meant that the fabric could go either way.....

I cut all the pieces up using a rotary cutter to start with but then I changed to the scissors when this happened....

I didn't do a photo for the next stage but I placed 2 of the same pieces of the fabric front sides together. I sewed along the 2 long edges, then turned them inside out and ironed them flat.
Here is a photo of all the pieces sewn up and ready to be joined together.....

Finally I trimmed all the loose threads and sorted them into a pattern. Choosing a complementary premade bias binding, I folded it in half and ironed it. Then I pinned all the triangles into the bias binding and sewed along the top. You could do this with zigzag or just a straight line depending on your confidence that it will all stay together.

And voila! Here's the finished product!

Who else has made bunting? I'd love to see some photos.