How can I hang a design on the side of my house?

String or Rope or Fishing String: Triple Braided 20lb Test, you wrap the strings around two eye hooks. Put tar or roofing cement around the eyehooks when you screw them in and also around where you screwed them, you will not get leaks for a long while. Ever you do get leaks, the fix is same: unscrew the eyehooks, cover them with roofing cement, screw them back in.

You can try Outdoor Command hooks heavy duty.

And your house has wood, brick, stone or vinyl siding?

I believe the house is wood

On back of tree just use E6000 adhesive to attach regular picture frame hanging hardware then use heavy duty command hooks to stick on house.Is it going to be out in freezing temps?? Command hooks may not stick you may need to use glue gun to attach command hooks but you can later remove hot glue with rubbing alcohol & cotton swabs. removing hot glue https://www.favecrafts.com/Techniques/How-to-Remove-Hot-Glue#How%20to%20Remove%20Hot%20Glue%20from%20Metal,%20Wood,%20Other%20Surfaces try little dab of hot glue some where on siding to see how easy you can get it off before you do it.