The finished product

 You can make one too! Here is how it was done:

First you need a leaf template. This can be done by first drawing a four centimetre line. Then use something round, about two centimetres in diameter, to draw a half a circle with the middle matching up with the end of the original line. Last connect the ends of the semicircle by drawing straight lines from them to the begining of the first line.

Trace the shape of leaf template on board so you have 35 leaves and cut them out.

Ok, now the fun bit. To make the colours, experiment with different shades of each colour, in order to try and blend them into each other. I used watercolour paints. Then paint each leaf with a roller sponge and order them in such a way as to blend into each other. For example, I started with dark blue and went through different shades until a light greenish blue - light green - dark green - dark brown - light, yellowish brown - yellow - orange - red - dark red - dark pink - light pink - purple. This gave it the effect of evolving through the colour spectrum.

Then you have to begin the evolution of the shape of the leaf. Starting from the bottom, in groups of threes, take out one extra triangle at a time. So the first group of three is the original rounded leaf shape with no cuts, the next has one triangle cut out, the next two etc. until the leaves at the top have become the spiky, end-product leaf, like so.

Finally, you have to prepare them in order on some kind of hanging stem or cord. I had wanted to do so in a pattern, placing them at angles on the way up like a kind of spiral but I could not get them to stay in place on the cord that I had used. Hang it in some kind of stand.