In Zest the default user logo shown on kickoff and sddm was changed to konqi. This was better than the seriously disturbing default face in stock KDE.
However, maybe we could change this again to a Kubuntu gear logo.
e.g.
**Monochrome:**
{F3912190} {F3912192} {F3912193}
**Blue gear**
{F3912199} {F3912197} {F3912195}
**SDDM and lockscreen background as default wallpaper**
{F3912200}