So for a guy that just loves theming via Nova Launcher, Zooper, UCCW, etc but hates that whole boggy full theme thing that Themer does, what are Cyanogen themes like? Considering jumping in the CM bandwagon for the first time if its worthwhile.
I use Nova Prime, but have the Android L theme setup regardless.
The CM theme engine works really well. There is zero lag, or glitches that I have found so far. The themes modify the boot screen logo, keyboard layout, dial layout, the notification tray, the settings menu's etc.
You can also download themes that are virtually identical to LG G3's android skin, Touchwiz etc.
Here are some screens of the Android L theme im using (
this one as a matter of fact) on my OPO (ignore the orange tint, I use twilight app):
That might give you a rough idea as to what the CM theme engine can do.