Please be gentle with me as this is the first tutorial I have done so I hope it all makes sense.
For this to be really effective you need to use double sided paper, not card, the thicker your paper is the harder this will be to get it to look really neat. On my card above I used Double sided card but as I printed it myself it was only on thin card and the other petals are pages from a book I got off the car boot sale for 10p.
To start you need a scalloped circle, I cut mine using my Nestabilities, if you count the scallops mine are an odd number this will make the final folding a little different
Fold your circle in half and firmly crease the fold using either a bone folder or as I do your thumb nail
Now turn the whole thing over and fold up so that the bottom edge lines up with the side edge again