I have always enjoyed creating QSLs for different activations. For years I supported myself at a printer who allowed to make (and sent) QSLs directly. After he disappeared I decided to give up paper printing also in view of the fact that few were the ones I received. Now, recently, I have discovered sending them digitally via email. These I use only for portable activities or QRPs but for symbolic exchange purposes only.
My QSOs confirmations are in LoTW for all activities.