I stumbled across your challenge in the reader and was instantly inspired to participate. I love the letter concept!
My first picture is an Alleyway In Philadelphia, PA I just had to capture the beautiful red brick and urban vibe radiating off of this winter time scene.
My next submission is a picture of Abstract tree bark I came across while walking through the Medford Arboretum in Medford, Nj.
My last image I am submitting is when I was Awestruck in Montreal, Canada by this street performer and his bubbles.