First of all, thanks to 2Fast4U. He wrote the source code for this nice design in OpenSCAD.

I wanted to hang a pair of scissors on the original hook. I did not find a setting that gave a good fit between the grip-through-hole of the scissors and the hook. Therefore I added some more editable variables to the original hook:

• point_size - Makes the tip of the hook more pointy or more blunt.

• more_cutaway - This makes the hook part more or less slender.
  [0:originalDesign to 1:maximumCutaway]

• base_convexity - The base has a constant convexity of 3 in the original. The printing layers are very well visible here when printed with layerheights >0.1 , as can be seen on the pics. Now you can adjust the convexity of the base.
  [0.001=flat, 3=original, 3+].

• cavity - If you use sticky tape: this can be hidden in a cavity below the base. If you use this feature, the hook must eventually be printed with support, and this may be difficult to remove.
  [0:OFF, else: cavity_depth]

• cavity_rim - width of the rim of the cavity.

Have fun with this nice looking customizable hook.