To make a flower similar to below, you can easily use some scrap fabric pieces. You can use various types of fabric and the size is totally upto you too. Even for the same flower, you may prefer to have different sizes of petals (eg. one large, one small, one large, one small and so on). Especially a small to medium sized flower can easily be formed by putting 5 petals together but you can change the number of it if you see the need for it. There is not many right or wrong options with this project.