I believe Jay is the Xposed expert here, I do use it myself to install a few mods such as the Overflow 3 Dot and Customizing the Power Menu, others that have been recommended to me are XPrivacy, XUtilities, and XuiMod. You can read about what these do in the Downloads on Xposed.
Wanam Xposed. Greenify donate.
You can play with Gravity Box JB (or kk if you have it), some features won't work on TW, its meant for AOSP. I've run it fine on TW though. Others are up to you. XDA just opened an Closed specific forum, so check it out.