Yes, qtcurve has been ported to qt5.
http://packages.ubuntu.com/search?keywords=qtcurve-qt5
Here is the full list of qtcurve packages:
http://packages.ubuntu.com/search?keywords=qtcurve
http://packages.ubuntu.com/search?keywords=qtcurve-qt5
Here is the full list of qtcurve packages:
http://packages.ubuntu.com/search?keywords=qtcurve