UniSkin

Make your custom editor skin with UniSkin :)

Features

Automatic
- Open Package Manager Window at Unity menu Window -> Package Manager
- Select「Add package from git URL」menu at the left top button
- Type https://github.com/piti6/UniSkin.git and hit Add button
Manual
- Include next line inside of manifest.json dependencies. "space.mkim.uniskin": "https://github.com/piti6/UniSkin.git"

Basically, UniSkin follows Unity layout system policy, as follows:
- UniSkin shares one skin per computer, across overall Unity versions and projects.
- You can save current skin as file or you can load skin from file.

Changes skin name.
Save current changes to current skin instance.
Save current skin instance and changes to file.
Load skin from file and overwrites to current skin instance.
Revert current edit changes.
Remove current skin and restore default Unity skin.
Select EditorWindow to inspect. Popup list shows current activated windows. (If you want to customize specific EditorWindow, you should open that window.)

Before to start

Changes in selected inspected window will referesh instructions list.
That is, edited all of instructions on current instructions list does not mean that every style was completely edited. there will be more that if you didn't check all possible elements on that EditorWindow (e.g Inspector window has plenty of GuiStyle, which is pain)

You can add custom background textures rendered by GUI.DrawTexture(ScaleMode.ScaleAndCrop);
Basically you'd prefer to use these to show backgrounds, as GuiStyle backgroundTexture uses ScaleMode.StretchToFill.
Usually there's plenty of non-transparent elements on EditorWindow that hides custom backgrounds. To show custom backgrounds, you should make them completely transparent status. check 「3. Edit style」section.

Select specific style to edit current Inspected window style.
Same style will be edited together.
If you select instruction, elements that uses same GuiStyle on EditorWindow will be highlighted so that you can recognizes which one you are working on.

Edit current selected elements style.
FontSize: changes font size. note that if selected style does not used for text display, of course it does nothing at all.
FontStyle: changes font style. (attribute, such as bold/italic)
Normal/Hover/Active/Focused/OnNormal/OnHover/OnActive/OnFocused
- Checkout https://docs.unity3d.com/ScriptReference/GUIStyle.html, it acts exactly same as it is. 「On」 series (OnNormal, OnHover, etc..) usually used in controls that has On/Off statement, such as Toggle/Checkbox.
Inside Foldout of one of above style
- Texture/Color
  - On Texture mode, you can use Texture as selected style background. note that this renders texture as ScaleMode.StretchToFill.
  - On Color mode, you can use Color as selected style background. Alpha value also affects to display, so you can use full-transparent color to hide current style background. which needs to show custom background textures.
- TextColor: changes text color. Alpha value also affects to display.

Issues/Pull requests are always welcome :)
I'm having trouble to decorate sample skin as I'm not a designer, so I appreciate your help to make a custom sample skin. (Which does not violates copyright)