Thank you so much! I'm really sorry for such a late reply.
These are made of office color paper. You'll need to cut paper stripes (mine were about 2,5 cm width) on one side, slightly curl the area you cut (i used a pair of scissors for it), then roll them around a needle or a toothpick. I used wire for stems, I wrapped it with green paper stripes and then sticked leaves on it. The hardest part was to attach the flower to the stem and hide the joint.
woah that's alot of work Anyway, after seeing your artwork I searched a bit. Then I knew that its called Kusudama, the name then helped me alot as I found many Kusudama tutorials on deviantart. They only explained the flower though, so your explanation will be really helpful in making a bouquet. Thanks & sorry for the late reply.