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Unfortunately, doing themes in Qt, complex one that manage color configuration, animations, shadows, good AA is not trivial stuff... And requires 2 things, Good designers, and better Coders.
Note that Oxygen Is AFIK the only QT, GTK, GTK2 theme that exists, and that loses no reconfigurability or significant features in any of the engines...
Its not the most exiting theme in the world, it was design to last the entire 4.x series, far more than any KDE theme until today. and doing that without becoming annoying or distractive wile pushing the frontiers of what we do and how we arrange apps in KDE.... I must say that I believe Oxygen to be a massive success, Never in KDE history as a theme lasted this long and pleasing so many, and at the same time being so discretely innovative in the amount of things a theme does in OSS.
With the advent of QML and QML components that might change... But don't expect anything revolutionary, in terms of volume of themes, Good configurable themes are still alot of work, specially if they are meant to be colorable..
Soon we will start talking about KDE 5.0 and what needs to be done for that, honestly Wen i started This fantastic experience I said I would only do the 4.x series and im not sure what will happen next, but I hope its something Fantastic.
Overall I'm incredibly happy with of he job we managed to do with a incredible small team of volunteers.
I will keep on working on oxygen several facets up until the last day of its existence.