I personally use mine very boring.. simple FLIRC case and ethernet cable chugged in and it hosts my personal website & discord bots...
A project I still want to do some day is hook up a camera to my Raspberry, hang it near the front door and experiment with facial recognition.
Tbh there is plenty of projects/fun experiments you can do with a Raspberry.
From small moving robots to recognition system and domotics.
For some inspiration I would refer you to these websites personally, as they give a lot of projects that you can derive from or reproduce yourself: ( [Only registered and activated users can see links. ] + [Only registered and activated users can see links. ] + [Only registered and activated users can see links. ] )