Paint all toilet paper tubes a nice shade of green. Let dry. Divide one of your toilet paper tubes into 3 equal sections. Cut on lines with the exacto knife.
Draw a line 1 cm from the bottom of the tube. Add leaflet shapes above the line around the entire tube. Do this for the other 2 tube sections as well. Cut out the leaflet shapes. You will have 3 little green crowns. Curve all the leaflets towards the outside of the crowns. Cut the crowns open.
Now take your egg carton and cut out 6 egg cups (2 for each flower). Do not cut through the middle of the egg carton. You will need the square parts that stick up in the center of the carton between each egg cup. See the image. Save 3 of those square parts. For each flower, you will trim 2 egg cups and 1 inner square part. Trim one of the egg cups as tall as possible and trim the other egg cup, a little shorter than the first. Cut petals into the 2 egg cups. On the tall cup, make deep cuts that go down to the bottom of the cup. Make these cuts all around the cup. On the short cup, make shallow cuts all around the cup. See picture.
Open up and curve the petals on all egg cups. Paint flower petals as desired. Paint inner square parts as well. Let all flower parts dry. As in the picture, draw a line 1 cm from both the top and bottom of each of the remaining 3 toilet paper tubes. Draw parallel lines all around the tubes. Use the exacto knife to cut through each parallel line as shown. Do this for all three tubes. Push out gently from the inside of each tube on all strips to create a vase shape. This is the flower stem. See photo.
Now you are ready to assemble your flowers. Assemble the flower parts. Glue an inner square part into each small petal egg cup. Now glue a small petal egg cup into each large petal egg cup. Glue an assembled flower to each stem. And your Carton flowers are ready!