Step 1:
You don't need to make exactly the same folds as I did for this rose. I'm not very precise making the folds for this model too, this makes each rose a little different from the others.

Make a valley-fold over this line.

Step 6:
Repeat step 5 on the other 4 sides of the model, see arrows.

Step 5:
Fold the right dot to the left dot.

Step 2:
Make a valley-fold over this line.

Step 4:
Now you've made a paper with 5 sides.
Fold the 3 ends of the model back to the outside by making a valley-fold over the blue lines.

Step 3:
Make a valley-fold over this line.

Step 10:
Press the bottom of the flower inwards from all angles, see arrows. Then, turn the bottom a little bit counter clockwise with your other hand.

Step 8:
Hold the model the same as I do in this picture.
Pull one of the corners at the arrows counter clockwise with your other hand. Do this with each corner that is indicated by an arrow.

Step 9:
Twist the model.
Make sure the model stays in the same shape while you do this.

Step 7:
Now the model looks like this.

Step 12:
Pull or curl some loose ends (see arrows) downwards.

Step 11:
The model won't open by itself anymore after the folds of step 10

Step 14:

Click here to see diagrams for making a stem
If your stem is to thick just fold it in half over the length to make it thinner.
Click here to see diagrams for making the leaves
You only have to push the edge of this leaf inwards with your nail on several places to make it look like the leaf of a rose (do this after step 13 of the diagrams).
Glue about 3 leaves to one stem.
                                                                               

The pot is filled with foam and I placed 7 stems with a flower on it in the foam.
Finally, I layed origami sand on top of the foam, to cover it.
Click here for instructions to make the origami sand

Step 13:
One flower is ready....

You can add a little glue to the bottom of this flower and glue it to the top of a stem.