The inspiration came from a Piano World thread (link1) with a simple composition exercise from a book. The idea is to write a simple melody, using a simple rhythm. I contributed to that thread, but wasn't pleased with that one.
However it did inspire to write Simply Beautiful (link2) in the key of C major, with a black key glissando. It is an easy piece to play and I enjoy playing it.
I uploaded a second version (link3), it uses the pedal to add to the echo and glissando.