[G2 General] xd.bx:
I really like the stock ROM and wanted to keep it, but decided to removed the bloatware. I got root with g2_security, remounted rw and proceeded to disabled all apk and enable them on a case by case basis. Here is the result, which you can use for the purpose of making your own minimalist ROM:

LGHome is required (home screen) as well as LGHome_Theme_Optimus

LGSystemUI, LGLiveWallpapersPicker, SystemUI_Provider and LGTangibleIO provide the user interface base

LGLockScreen and LGLockScreenSettings are self explanatory

LGIME + LGIME_THEME* provide the on screen keyboard

FusedLocation is required by LGHome, otherwise it will bootloop

LGSettings and LGSettingsProvider are essential as well

LGSystemServer manages a number of hardware devices (LEDs...)

SetupWizard has to run at least once iirc, otherwise the Home button does not work :o (but afterwards can be disabled)

DefaultContainerService is required for the installation of APKs

Note: to prevent the default APKs (LGLW_PolarBear, ...) from being installed, move them out of /system/apps/bootup. Typically I use /system/app/disabled to stored disabled APKs.

Next, the following components can be enabled depending on what you need:

LGPhone, LGTelephonyProvider, LGContacts, LGContactsProvider and LGMessage (most people will want this)

HiddenMenu for debugging infomation (use 3845#*802#)

GMS_Maps, plus com.qualcomm.location (required for GPS)

LGBluetooth4 is required to connect to Bluetooth devices

LGAlarmClock, LGClockWidget, LGBrowser, LGCalculator, LGCalendar, LGCalendarProvider and LGCameraApp are self explanatory

LGDownloadProvider and LGDownloadProviderUi is used by browser and other apps

LGEmail is useful to get an Exchange account (like, live.com) and get the calendar working if you don't enable gapps

LGFileManager, LGFlashlightWidget, LGFmRadio, LGGallery, LGMusic, LGMusicWidget and YouTube can be useful too

LGVideos, LGVoiceRecorder, LGWeather and LGWeatherTheme: ditto

MediaProvider is required for LGFileManager and possibly others too

UserDictionaryProvider for custom dictionaries

I am however using an older Maps, version 6, extracted from a nexus factory image. In particular is allows downloading much larger off-line maps.

Finally let's mention the following APKs that I'm not sure are completely necessary, but I've included them since they are part of the CyanogenMod sources:

HTMLViewer

InputDevices

KeyChain

SharedStorageBackup

VpnDialogs

After disabled useless APKs, I recommend doing a data/cache wipe from CWM, to get into a new clean state. It's worth noting I don't enable the Google Apps, since I manually install APKs that I download from another phone. This works quite well, although I had for example to patch Deezer's dex code to remove a dependency on GSF. In addition, the Phone application FC when a bluetooth headset is connected which is a bit annoying. So it's probably easier to keep the Google Apps enabled. For the record, I have disabled the following apps:

AAT.apk LGClockWidget.apk LGVideoEditor.apk
ApplicationsProvider.apk LGConnectionWizard.apk LGVideoManual.apk
BackupRestoreConfirmation.apk LGDefaultAccount.apk LGVuTalk.apk
Books.apk LGDictionary.apk LGWirelessStorage.apk
CameraTestApp.apk LGDMSClient.apk LGWorldClockWidget.apk
ChromeBookmarksSyncAdapter.apk LGDMSGCM.apk LicenseProvider.apk
ChromeWithBrowser.apk LGDrm.apk LinkCompanion3.apk
CloudHub.apk LGEasySettings.apk LteConfigs.apk
com.lge.pr.hidden.MLTest.apk LGFavoriteContactsWidget.apk Magazines.apk
com.lge.shutdownmonitor.apk LGFOTA.apk MediaUploader.apk
CompatibilityMode.apk LGGestureAnswering.apk MLT.apk
com.qualcomm.services.location.apk LGHome_Theme_Marshmallow.apk Music2.apk
ConfigUpdater.apk LGInstallService.apk NetworkLocation.apk
DirectBeam.apk LGLifeStream.apk PackageInstaller.apk
DmfAdmin.apk LGLifeStreamLogManager.apk PCSyncUI.apk
DoubleTapWakeup.apk LGLW_Feather.apk PermissionToAccessLgeApi.apk
DrmProvider.apk LGLW_MultiPhoto.apk Phonesky.apk
DrmService.apk LGLW_PolarBear.apk PlayGames.apk
ELTTest.apk LGLW_Prince.apk PlusOne.apk
FaceLock.apk LGMemo.apk qcrilmsgtunnel.apk
FontServer.apk LGMemoWidget.apk QuicksetSDK.apk
Gmail2.apk LGMITS.apk SmartShare.apk
GmsCore.apk LgNfc.apk SmartShareBeam.apk
GnssAirTest.apk LGNotebook.apk SmartShareProvider.apk
GnssPosTest.apk LGOnScreenPhone3_JB.apk Stk.apk
GnssTest.apk LGPartnerBookmarksProvider.apk Street.apk
GoogleBackupTransport.apk LGPhotoAlbumWidget.apk SystemUI_Theme_Black.apk
GoogleCalendarSyncAdapter.apk LGPhotoTable.apk SystemUI_Theme_Black_Gradation.apk
GoogleContactsSyncAdapter.apk LGPolarisViewer.apk SystemUI_Theme_White.apk
GoogleFeedback.apk LGQMemo.apk SystemUI_Theme_White_Gradation.apk
GoogleLoginService.apk LGQRemote.apk TagGoogle.apk
GooglePartnerSetup.apk LGQTranslator.apk talkback.apk
GoogleServicesFramework.apk LGSafetyCare.apk TimeService.apk
GoogleTTS.apk LGSearchWidgetProvider.apk UnifiedEULA.apk
Hangouts.apk LGSettingsAccessibility.apk Upsell.apk
HiddenSIMUnlockMenu.apk LGSlideAside.apk Velvet.apk
HomeSelector.apk LGSmartcardService.apk Videos.apk
LGApduService.apk LGSmartWorld.apk VoiceSearchStub.apk
LGAppCleanup.apk LGStartupwizard.apk WAPPushManager.apk
LGApplicationManager.apk LGStreamingPlayer.apk WapService.apk
LGAssistantStub.apk LGTaskManager.apk wind_155_2.3_Prod_build_5.apk
LGATCMDService.apk LGTasks.apk WiseScreen.apk
LGBackup.apk LGTextTranslator.apk WVTest.apk
LGBasicDreams.apk LGUpdateCenter.apk
LGCb.apk LGVidClip.apk