I visited a Montessori School today and I was surprised and delighted to see Noor Janan Homeschool's Arabic Letters being used. I loved the colors that they used. It really warmed my heart.
All Noor Janan Downloads are free and can be found on their respective page tab above. The Arabic Letters are on the I ♥ Islam page. Alhumdulilah, All Praise is for God.