xvenom89's NuBlu v1.1 (for MIUI framework 0.10.29) works very well with D1-MIUI v6.3 with no modifications. Just flash over v6.3 or v6.3 unofficial mod by Jrizzill (I've tried over both).
NuBlu 1.1: ¤¤ [Theme] NuBlu v1.0 [10/30] [MIUI 0.10.29] ¤¤ - xda-developers
Presumably, his SmoothGreen/Red/Blue themes should work, though previous versions crashed if I did not remove certain system apps from the zip (particularly, I believe it was the Phone.apk causing issues/crashes). Removing the system apps in the zip and flashing the framework should definitely work (Until NuBlu came out for 0.10.22 framework, I had used SmoothGreen's framework only with every corresponding D1-MIUI version), but do it at your own discretion as I haven't tried them myself (NuBlu is just too perfect a match for MIUI).
SmoothGreen 1.4: ¤¤ [Theme] Smooth Green v1.4 [10/30] [MIUI 0.10.29] ¤¤ - xda-developers
SmoothBlue 0.7: ¤¤ [Theme] Smooth Blue v0.7 [10/30] [MIUI 0.10.29] ¤¤ - xda-developers
SmoothRed 1.2: ¤¤ [Theme] Smooth Red v1.2 [10/30] [MIUI 0.10.29] ¤¤ - xda-developers
NuBlu 1.1: ¤¤ [Theme] NuBlu v1.0 [10/30] [MIUI 0.10.29] ¤¤ - xda-developers
Presumably, his SmoothGreen/Red/Blue themes should work, though previous versions crashed if I did not remove certain system apps from the zip (particularly, I believe it was the Phone.apk causing issues/crashes). Removing the system apps in the zip and flashing the framework should definitely work (Until NuBlu came out for 0.10.22 framework, I had used SmoothGreen's framework only with every corresponding D1-MIUI version), but do it at your own discretion as I haven't tried them myself (NuBlu is just too perfect a match for MIUI).
SmoothGreen 1.4: ¤¤ [Theme] Smooth Green v1.4 [10/30] [MIUI 0.10.29] ¤¤ - xda-developers
SmoothBlue 0.7: ¤¤ [Theme] Smooth Blue v0.7 [10/30] [MIUI 0.10.29] ¤¤ - xda-developers
SmoothRed 1.2: ¤¤ [Theme] Smooth Red v1.2 [10/30] [MIUI 0.10.29] ¤¤ - xda-developers