All of my themes use Themes+ and Nexxutils. Themes are dark mode.
Edit: This is pretty outdated and hasn't been updated in a while, so take all of this with a grain of salt.
REDESIGN_BUTTON_SECONDARY_BACKGROUND - Colour of "Add status" button (tabsv2) Colour of "Edit profile" button (tabsv2)
REDESIGN_BUTTON_SECONDARY_ALT_BACKGROUND - Backround colours for: Attachment button Gift button Search button (tabsv2) Add friends button (tabsv2) Message request button (tabsv2) Events button (tabsv2)
REDESIGN_BUTTON_SECONDARY_BORDER - Border for "Add status" button (tabsv2) Border for "Edit profile" button (tabsv2)
BACKROUND_SECONDARY - Outer background for profiles Outer background for forum posts Background for single line code block thingys Outer backround for context menus (tabsv2) - can be overwritten by BG_BASE_SECONDARY Audit log info backround
BACKGROUND_MOBILE_SECONDARY - Header colour
BACKGROUND_MOBILE_PRIMARY - Audit log outer background CloudSync outer background (CloudSync)
BACKGROUND_MODIFIER_ACCENT - Deals with the background for icons in the settings menu
BG_BASE_PRIMARY - Outer chatbox background Top chat header (tabsv2) Channels list (tabvs2) Messages page (tabvs2) Notifications page (tabvs2)
BG_BASE_SECONDARY - Settings pages Outer background for context menus (tabvs2)
CARD_PRIMARY_BG - Inner backround on you tab page Inner backround on context menus (tabv2) Md3 toast and modal backrounds (nexxutils)
REDESIGN_CHANNEL_CATEGORY_NAME_TEXT - Changes Color for channel color headers
BRAND_260 - Themes "OP" background in forum posts Pronoun tag background (pronounDB, Horror)
BRAND_500 - For the switch trance
BRAND_560 - "OP" button text colour in forum posts
PRIMARY_100 - Settings > nitro gifting > nitro gift backround (light mode) Colour of "cancel" button in app authorise page
PRIMARY_130 - Themes navigation bars (light mode) (tabsv2)
PRIMARY_160 - Does nothing on dark mode Some hover effects (tabsv2) Splash screen colour (light mode)
PRIMARY_200 - Does nothing on dark mode Role chips (server settings > members) (light mode)
PRIMARY_230 - Attachment icon, gift icon, voice note icon (dark mode) Toast popups (nexxutils)
PRIMARY_300 - Themes gear icon in notification popups (dark mode)
PRIMARY_360 - Read channel names (dark mode) (tabsUI)
PRIMARY_400 - Channel icons Turned on switch
PRIMARY_460 - Colour of "Add status" button (dark mode) (tabv2) Colour of "Edit profile" button (dark mode) (tabv2) Read channel names (light mode) (tabsv2)
PRIMARY_560 - Activity cards (tabsv2)
PRIMARY_600 - Splash screen (dark mode) Inner background of md3 switch toggles (nexxutils)
PRIMARY_645 - Some hover colours (dark mode) (tabsv2)
PRIMARY 700 - Chatbox colour (dark mode) Toast popups (dark mode) Search bar (dark mode) (tabsv2)
PRIMARY_800 - Audit log filter chips (light mode) Navigation bars (dark mode) (tabsv2)
PLUM_1 - Color for unread channels
PLUM_3 - attach file/nitro button, add status/text icon, edit profile/icon, and text in chat (dark mode)
PLUM_6 - text preview for replied messages, react count for emotes under messages, and add reaction button under messages.
PLUM_9 - channel list catagories
PLUM_10 - minor text color, read channel color and any where a channel is being referenced
PLUM_11 - chat box bg and accent bar under browse channels
PLUM 13 - pressed button background
PLUM_16 -
PLUM_17 - background for scroll to bottom of chat/new messages button
Selected emoji/gift/sticker button (dark mode) PLUM 18 - inner background for profiles (forced transparency) PLUM_19 - background for activity cards
PLUM_20 - background for channel list and user preview when someone is typing
PLUM_22 - background that pops up when you swip a comment to reply
BLACK_500 - Transparency in context menus Backrounds for search, attachments, gift buttons (light mode) (tabsv2)
WHITE_500 - Bot tag text Emoji context menu text Turned on inner backround for switches (tabvs2) "Enable" button in push notification disabled message Text in notification bubbles "Get nitro" text in emoji context menus & edit profile page "Invite" text on invite button in channels list Text colour for nitro gift embeds in nitro gift menu
WHITE_630 - Md3 turned off button outline (nexxutils)