You need: a photo or a picture from a magazine, pencil, paint (watercolor or crayon) or other drawing materials.
TIP: Don't use a big picture. 

Look at the picture and think about how you can make the picture more beautiful. Maybe you can change the color of a piece of clothing, turn the landscape into wallpaper ...
TIP: It's most fun when you let your creativity run wild. 

Take out a picture frame (for example from a slide or make one for yourself), look through it and draw what you see in that frame. With the frame you focus on a detail and not on the whole.
Tip: Do it together. That way you can guess the drawings of the others.

Have fun!

You need: A piece of paper with a spot of paint, stain, line or something "random" that someone has stained for you on the paper or a piece of paper that you found in the waste paper. And you need drawing materials.

TIP: It is nicer if your drawing material is different from the stain. If the stain is coloured, draw with a coloured pencil, pencil or chalk. 

Now you can make something out of this smudge. A landscape, a man, an animal, a monster, a room ... Let your creativity run wild!

Have fun! 

Plastic or aluminium cling film is pretty much out of fashion ... and the alternative "beeswax tissues" can be easily made by yourself. By the way, this also works with the vegan variant carnauba wax. 
Here you work with a hot iron and you can leave a pretty sticky kitchen, so don't do it without an adult!
Good luck!

You need: baking tray, iron, baking paper, beeswax, (candle remnants or beeswax lenses) or carnauba wax, grater, knife, scissors, container for the wax pieces, cotton cloth remnants and: one adult :-)

Crush your wax pieces and candle remains. You can use a grater or a knife/scissors for this. Beeswax is relatively soft (and sticky!), so I used a knife after the grater was sticky. 
TIP: If the wax was in the fridge for a short time, you can grate it again.

Cut a piece of fabric (cotton!). The piece on the picture is about 22 x 17 cm. Put a piece of baking paper on the baking tray, on top of it your piece of cloth. The baking paper should be bigger than the piece of cloth, otherwise you will have wax on the baking tray afterwards.

Now you can spread your wax pieces on the fabric. Try to do it as evenly as possible.

Over your waxed piece of cloth comes now again a piece of baking paper.

Now comes the exciting part: With a preheated iron (level 2 is enough) you run over your piece of cloth. The wax residue melts and, because it is now liquid, is drawn into your piece of cloth. When you are satisfied with the even distribution of the wax, wait a moment, let everything cool down a bit and turn the whole package with the two layers of baking paper and the cloth in between once so that you can melt the backside as well.

When everything (including the baking tray!) has cooled down well, you can carefully separate the paper and cloth. In the picture you can see how the cloth looks like with and without wax layer.

You now have a cloth that you can put over small bowls or plates or wrap fruit in. It must not get too warm, because you would melt the wax layer again.

With a pen, paper, painter's crepe, scissors, magazines or photos you are ready to face this challenge!  

Choose a picture that you like and fix it (with painter's crepe) on the window pane.

Stick the paper over the selected image on the window. Now, without removing the pen from the paper, try to go around the image so that you have a single line. 

TIPS: 
Try using a different image, drawing materials such as chalk and paint. 
No paper? Maybe you have newspapers or other waste paper to draw on. 

You need this:
paper, lemon juice, brush or pen and a candle. 

Write your secret message with brush or pen and the lemon juice as "secret ink". When the written text is dry, you can no longer read it. 
To read the message, move the paper back and forth about 20 cm above a candle flame.
Careful! Do not hold the paper too close to the fire! Ask an adult for help. 

You need a square piece of paper that you can easily fold and love little words on pieces of paper. 
Turn the rectangular paper over and fold one edge a little bit.
Fold the paper horizontally through the middle.
Fold the left corner in the middle.

Repeat this for the right corner. As you can see in the picture, the triangles are not connected. 
Fold the lower right corner diagonally. 
Repeat for the left corner. 
Fold both corners back to their original shape.  
Fold the left tip point on the fold line to the middle of the centre line.

Repeat this for the right tip point as well, to get a kind of diamond shape. 
Take both middle flaps and fold them into the bag. 
Now you can inflate the heart by blowing into the lower hole.
The sweet words you wrote down, you put them through the opening from below into the heart.