The best thing about these is the wool. It's called "Wash and Filz it" and it's a washing machine felting wool. This means that I make a wobbly flower with my novice crocheting and then I pop it into the washing machine (usually with a load of dark or colourful washing) and it comes out all tight and neat - hurray!
The larger flower is made using a pattern from the Mollie Makes magazine, with a covered button in the middle, I found that pinning them onto a piece of printed card made the brooches look even smarter.
I'm afraid I can't link to the pattern for the rose as I'm fairly sure I've been following it quite badly and mostly making it up as I go along - it's all to do with the difference between American and English crochet patterns. However my method seems to work quite well and it looks nice at the end!