Using a very sharp knife, or a mandoline set on the thickest setting, carefully slice your cucumbers into 1/4-inch slices.
Sprinkle each slice with a tiny pinch of salt, to help it bend when creating your trees.
Meanwhile, using a mini star-shaped cutter, cut stars from the cheese slices.
Slice your cherry tomatoes in half to create the bottom of the trees.
Pat your cucumber slices dry with a paper towel before assembling your trees.
To assemble:
Start at one end of the cucumber slice and gently fold it back and forth; begin with small folds and gradually bigger folds with each one, until you have created a pine tree shape as shown in the photos. Insert a skewer through the middle to thread it from top to bottom. Separate and arrange the folds gently, to make them look more authentic.
Push the skewer into a cherry tomato half, cut side down to create stability for your tree on the bottom.
Add a cheese star to the top of your tree.
Repeat with remaining ingredients; arrange the trees on a platter and serve immediately!