Step 1:
Glue or tape two a4-size papers together.

Step 8:
Pull the part on the right upwards by folding over these lines.

Step 6:
Unfold the model

Step 13:
Make sharper folding lines, do the same on the other side of the bag.

Step 12:
Press the edge indicated by the arrow to the left by folding over these lines.
Do the same on the other side of the bag.

Step 11:
This is how the model looks now.

Step 10:
Glue or tape the edges to the model

Step 9:
Repeat step 8 on the left.

Step 5:
Valley-fold over these three lines.
The two horizontal lines are twice as far from the edge then the vertical line.

Step 7:
Fold the prefolded lines into the right direction.

Step 3:
Fold the wrapping paper around the white paper. Use tape or glue to fix the edges.

Step 2:
Take a piece of nice wrapping paper and lay it under the white paper. If your paper is already looking nice enough, you don't need to do this.

Step 4:
Fold in half.

Done!

These are real flowers in cute paper bags. You can decorate the bag with a large bow, ribbon or a nice drawing.

In this video Joost Langeveld also shows how to fold the bag for flowers: