I used fabric that I had already, as well as some new fabric from Ikea - a lot of it was in the bargain corner and started life as curtains or duvet covers.
I made a cardboard template of the shape and size I wanted for the bunting and then cut out lots of bunting pieces from different materials. As you can see from the picture, I left a lip at the top of each triangle - this is so I can attach it to the cotton tape to hang it from. I am making mine double sided so once I cut out lots of triangles, I machine sewed them together, close to the edge. I sowed them right side out - this was easier than trying to sew them right sides facing and turn them out. The bunting will be hung up high so it doesn't matter it the stitching isn't perfect. I am also making place mats and jam jar covers to go on our jam favours from the same fabrics. Now I have all my buting triangles the next job is to attach them all to the cotton ribbon. I'll post an update as soon as I have made some progress!