“Enawas” from Logic Pro Help Forum has modified a new theme. A simple looking one but – let me assure you – this has obviously needed a lot of work. The result is very fine indeed.
It seems to me it might be for Retina screens as well, yet at least some of the added icon images are non-retina only. If someone can confirm that otherwise it is Retina compatible, please leave me a comment below.
(Those of you who know what you are doing, go straight to folder 3 in the package.)
For updates, see here: http://www.logicprohelp.com/forum/viewtopic.php?f=1&t=97685&start=300