You can integrate them into Vitae Generators to double their production speed, though the game doesn't have a sprite for human-integrated generators, so put the attached folder in the img/charfeatures folder. Useful for saving space and resources.
You can integrate them into a number of crafting buildings, but assigning drones to craft softlocks the game, so that's for decoration only.
You can integrate them into light nodes for actual, intended decoration, which works as intended.
Finally, you can tell drones supported by a drone expander to web them to walls with a behavior node, and then tell drones to milk them... except the node and the drone expander cost neurotissue, the production of which is bugged, and milking captives is non-functional. It's also automated, so you can't pick and choose where to put people or who to web, so it's not useful for decoration either.