The IDLE icons are from https://bugs.python.org/issue1490384 Created by Andrew Clover. The original sources are available from Andrew's website: https://www.doxdesk.com/software/py/pyicons.html Various different formats and sizes are available at this GitHub Pull Request: https://github.com/python/cpython/pull/17473 The idle.ico file was created with ImageMagick: $ convert idle_16.png idle_32.png idle_48.png idle_256.png idle.ico