Yep my systray use to look like this
Yahoo weather & Gmail feed on the end there.
Fiddled around with changing Look & Feel to Changing themes trying out new ones.
Switched back to the way I had before now system tray icons are different.
Looked and change icon themes and such still no joy tho the app launcher icons & Menu icons are back to the way they were. So scratching my noodle and things coming out of my ears. Trying to figure out what monkey thing I did or not. As tried all the icon sets I had and doesn’t seem to get my intended icons back.
Any help is appreciated as just want my usual icons I had. Which been running Oxygen for long time.
Look & Feel : Oxygen
Desktop Theme: Oxygen