I had some left-over holes in the bathroom and figured I could use them for towel hanging. Keep in mind that I haven't done any great calculation as to the angle and shape - I simply used my intuition, and they turned out quite well.

They are tons of other great designs on thingiverse with hooks, but none seemed to fit exactly what I wanted. I use them with both 1 and 2 screws, but printed only with two.

.f3d files uploaded in case you want to customize it.

Printed with PLA, 15% infill.