So I took 10 minutes and came up with a simple template dividing an A4 sheet of paper into 5 squares and 1 rectangle for the branches and trunk and coloured them into the corresponding colours, so that anyone with a printer can print out the template in colour or colour it in and fold it into Christmas tree for their desk or apartment. Perfect for any room.
The great thing about the A4 page is that it can be scaled up to A1 meaning you could in theory make a massive Christmas tree based on the template.
Step 1: Print and cut
Then cut it out very carefully.
Step 2: The branches
Now unfold it all and fold vertically and horizontally in half and unfold.
Then take the corners and fold them into the center where all the creases meet and repeat for the remaining corners.
Then take the two vertical edges and push them inwards towards eachother to create a waterbomb base, it's explained well - here
After that pull down one of the white flaps and fold the corner of it over to the right point of the waterbomb base and to the other point.
And repeat on the remaining flaps.
Afterwards fold the edge of the downwards to the bottom (the pictures should help with this step).