For this easy DIY idea you´ll need black paper, a pair of scissors, a white crayon and double-faced adhesive tape.
Step 1: draw the kitten on the black paper
Step 2: Cut the kitten out of the paper and don´t forget the eyes
Step 3: Put some tiny stripes of double-faced adhesive tape on the back side of the kitten
Step 4: Stick it on your walls, windows, …