C7 / C9 TuffClip Roof Top Gutter Clip (100SLATUFF) - Action Lighting™, Inc.
Choosing The Right Christmas Light Clips For Roofline and Perimeter Lighting - Christmas Designers
Gutter hooks for icicle lights.
Amazon.com: HLO Lighting Omni All-in-One Christmas Light Clips | Hang C9 or C7 Light Strings from Rain Gutters or Shingles | Pack of 100 Clips : Tools & Home Improvement
Holiday Light Aluminum Gutter Hooks - Put em up and leave em up!