Hey there @CubicleNate .
It looks like there is a Qt clone of Zenity, but it’s not popular or packaged for most distros:
Probably the best option for a Plasma user would be KDialog:
The only caveat is what I mentioned here about plain Qt vs Qt-with-KDElibs. KDialog uses the entire KDE Framework, so extremely heavy dependencies if the system doesn’t have Plasma already installed.