I've always loved origami, so this challenge was right up my alley. I found some origami roses on the pintrest board that I liked, and decided to give them a go. Unfortunately, the linked tutorial only gave about half of the instructions and I didn't know it, and I almost gave up in frustration when I couldn't get them to come out.
But! I went on Youtube and found the full tutorials I needed, and ended up making four different variations of rose, as well as three different leaves.
The large yellow one was the simplest, called a Bird Base Rose: https://www.youtube.com/watch?v=hntACo6ZdMk
The blue one is a basic rose, and it gave me a little trouble because I kept making creases I shouldn't have. I ended up with two blue crumpled paper ball toys for my cat before I got one completed: https://www.youtube.com/watch?v=wSesWQ-51ZM
The small purple and pink roses are called Kawasaki Roses, and are definitely not for beginners. They were the hardest to figure out, but the most fun for me just because it was a challenge. (I just kept thinking, whoever first invented this rose must have been an origami genius.) Thus, why I made two. The first time I was shaping the rose, I kept saying, "IT'S BLOOMING! IT'S BLOOMING!" https://www.youtube.com/watch?v=sSwiHZWjuZM
The leaves came from various sources.
The pointy one on the top-right of the yellow flower was from the blog post with the poor flower instructions. Fortunately, all the instructions for the leaf were there (it's also at the end of the basic rose tutorial): http://www.bloomize.com/origami-leaf-with-or-without-veins/
The other two, I found just by googling "origami leaves".
The large rounded one was my favorite to make, although the instructions say to use scissors, which is blasphemy in origami! I used a much more acceptable way of folding it to shape it: http://www.origami-flower.org/origami-leaf-single/page-11.php
I'm not very impressed with the technique of the small wavy one, but it looks ok when it's finished:: http://www.instructables.com/id/Origamy-Leaf-Tutorial/
The last one was something I ran across on Youtube while looking for the other tutorials. I thought it was an ingenious idea, and looked nice when finished, so I went ahead and added that one to my collection last-minute. It's called a Magic Rose Cube, because it can be folded up into a box, and unfolded into a flower at any time. https://www.youtube.com/watch?v=A8EyLFWXV_0
So, overall, I had a TON of fun making these. I have lots of scraps of colored paper now, as well as a number of "cat toys"... though my kitty doesn't seem very interested in them so far. Oh well.