Taking advice from community feedback, I decided to cut out the Hearts and Mana UI as a separate resource pack.

Affected files are all of those contained in the following folders:
...\PlayerResources\FancyClassic
...\PlayerResources\HorizontalBars

as well as the following files:
- Heart.png
- Heart2.png
- Mana.png


Tweaks:
...\Images\
- Inventory_Back15.png - changed border to yellow for easier visibility
...\Images\UI\
- Scrollbar.png
- ScrollbarInner.png
- SearchCancel.png - Made the outline thinner to match other buttons
- Bestiary.png - Made the icon thiccer so it matches the grid of the other icons
...\Images\UI\Bestiary\
- Button_Search.png - Made the outline thinner to match other buttons
- Button_Search_Border.png - same changes as btn_search

Added:
...\Images\UI\
- PVP_0.png
- PVP_1.png
- PVP_2.png
- ButtonFavoriteActive.png
- ButtonCloudActive.png
- ButtonCloudInactive.png
- ButtonDelete.png
- ButtonFavoriteInactive.png
- ButtonPlay.png
- ButtonRename.png
- ButtonSeed.png
...\Images\UI\Bestiary\
- Button_Border.png
- Button_Back.png
- Button_Forward.png
- Button_Filtering.png
- Button_Sorting.png
- Button_Wide_Border.png
- Slot_Back.png
- Slot_Front.png
- Slot_Overlay.png
- Portrait_Front.png
- Stat_Attack.png
- Stat_HP.png
- Stat_Defense.png
- Stat_Knockback.png
- Stat_Copper.png
- Stat_Silver.png
- Stat_Gold.png
- Stat_Platinum.png

v.1.4

Originally, I was planning to change only the CreativeMode UI and Heart/Mana UI with this version of the pack.
But, apparently those parts make use of resources from other folders in the game's data. This kinda annoys me as a modder cause then there's no singular directory to just pull all the images from, and it also makes looking for them harder/take more time. But I can sort of understand cause I'd probably do the same thing hahah

Tweaks:
- changed the icon for the Steam Workshop page to finally be 512px instead of 128px. Honestly, it's annoying that I can only do that with a separate update and not just directly change the icon from the workshop page itself >:/
- Inventory_Back17.png - added "faved" detail at top right corner. Finally found out what the difference was between this and inv_back14

Added:
- TexturePackButtons.png
- SearchCancel.png
- Chat_Back.png
- ClothesStyleBack.png
- HairStyleBack.png
- Hue.png
- Achievement_InnerPanelBottom_Large.png
- Achievement_InnerPanelTop.png
- PanelBackground.png - what the hell. So this made up that big of a portion of the UI. Who knew something so inconspicuous had so much use
- PanelBorder.png
- Extra_243.png
- ColorSlider.png
- ColorBar.png
- Slider_Highlight.png
/ HorizantalBars HealthMana UI:
- HP_Fill.png
- HP_Fill_Honey.png
- HP_Panel_Right.png
- MP_Fill.png
- MP_Panel_Middle.png
- MP_Panel_Right.png
- Panel_Left.png
/ FancyClassic HealthMana UI:
- Heart_Fill.png
- Heart_FillB.png
- Heart_Left.png
- Heart_Middle.png
- Heart_Right.png
- Heart_Right_Fancy.png
- Heart_Single_Fancy.png
- Star_A.png
- Star_B.png
- Star_C.png
- Star_Fill.png
- Star_Single.png
/ CreativeMode UI
- Infinite_Tabs_A.png
- Infinite_Tabs_B.png
- Research_Slots.png
- Research_Spark.png
- Infinite_Icons.png
- Research_FramedPistons.png - didn't do a redesign of this but I had to tweak the upper side to cover up a very small but very noticeable gap inside the research window UI.

v.1.3

Tweaks
- Inventory_Back5.png - made it darker so it won't seem to blend and disappear against lighter backgrounds. Also added a small detail thing at mid-bottom.
- Inventory_Back2.png - made it darker and added a small detail thing to match inv_back5.
- Extra_54.png - changed dye icon opacity and centered the other icons in their boxes.
- Inventory_Back12.png - improved visibility a bit but not too much so the dye slot maintains it's subtle presence.
- Inventory_Back6.png - made it darker and added a small detail thing to match inv_back5.
- Inventory_Back10.png - made main area a bit darker to reduce contrast against regular inv slots.

v.1.2

- removed the preview images that I accidentally included in the folder last time (a bit unecessary but it added an extra 1-2 Mb that wasn't useful as part of the resource pack). These are the same screenies shown in the Steam Workshop page.
- added "Golden" Minimap Reskin as an alternate layout.
- tweaked "Trash.png" a bit.
- added "Extra_54.png" - after looking really hard, I finally found the dang icons I've been looking for haha
- added "Extra_58.png" which is the shield icon that shows your def amount
- testing around with "Text_Back.png"
- added "Inventory_Back13.png" - didn't know what this was for until my sister pointed out stuff about inventory sorting. Still can't seem to figure out what "Inventory_Back16.png" is for..

v.1.1

- added "Default" Minimap Reskin
- updated "ChestStack_0.png" and "ChestStack_1.png"
- added "Trash.png"
- added "Achievement_Borders.png", "Achievement_Borders_MouseHover.png", and "Achievement_Borders_MouseHoverThin.png"
- << retracted >> - tried adding "Cursor_0.png", "Cursor_11.png", ....... doesn't seem to work ....... nvm got it to work by sizing it back down.
- added "DisplaySlots_etc" icons for Camera Mode, NPC Housing, and Equipment

v.1.0 - Initial Release