I designed this adorable cloud shelf, and my girlfriend is obsessed with it! It attaches to the wall with a hidden cleat (which prints separately), making installation a breeze.

It prints with the cloud against the print bed, so there's a big void where the hole for the cleat is. But it bridges fine if your settings are dialed in, and any minor imperfections will be hidden from view. If you have trouble and need supports, make sure “build plate” only is checked, to prevent you from having to dig supports out of the section where the cleat has to catch onto.