Some of the most beautiful origami models are the origami flowers... they look so stunning when made with either plain of pattered paper, and displayed in groups!
If you are a beginner, I would recommend starting with the Blossom and then the Lily, they are both great traditional designs, and people love receiving paper flowers as token gifts: they are so thoughtful and sweet: and what could be more personal than something made with your own hands? :-)
I'm always adding new diagrams to this site; so make sure you check back later if the flower you are looking for isn't here yet.
The Rose and Lotus pages have videos for you to watch and learn the technique: so even though these are harder designs, give them a go: with the help of the video, they become quite simple!