This is an easy pattern for making a 3 layer rose.
For more flower patterns, see this link:
http://www.etsy.com/shop/Hectanooga?section_id=6318866

If you use worsted weight yarn, and a size 6.5mm crochet hook, you will get a 4 inch diameter flower.
A size 5.5 hook, will result in a 2 inch diameter flower.
Use sport weight yarn, and a size 4.5 mm hook, for a smaller flower.
Crochet thread and a small metallic hook will result in a small, compact flower!
Or if you would like a gigantic 6 inch flower, for a pillow or other such large item, use 2 strands of worsted weight yarn, and a size 9mm crochet hook!

Lots of possibilities here.

No abbreviations in my patterns, and as always, feel free to sell your finished flowers.