This is a paid asset, but now you can download Dark Flat Fullscreen GUI / UI Kit – over 650 PNG! for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Dark Flat Fullscreen GUI / UI Kit – over 650 PNG v1.0
Contain graphics for:
Screens:
Login
Settings (video, audio, game & controls)
Shop
Inventory
Quests
Levels
Skills
Chat
Achievements
Create & Select Character
Windows:
Login
Pause
Exit
Item info
Chat
124 Unique Items & Icons
in 5 sizes: 32x32px, 64x64px, 128x128px, 256x256px, 512x512px
Buttons (customizable colours in Unity):
Regular
Outlined
Buttons with icons (regular & outlined)
Close, Help, Info, Share
Checkbox, Switch, Radio
Other elements:
Health & Mana Bubbles
Health & Mana Bars
Exp & Progress Bars with glowing fill (in 5 colours + white)
Scrollbars
Sliders
Input fields
Chat clouds
Action bar
+ Complete .psd editable files
+ .ai file with items & icons
Manual & tutorials
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…and many, many more.
Check out also:
Full Fantasy Game Set / Bundle