Oracle SQL Developer

Unfortunately Oracle doesn't make it easy to import a new colour scheme into SQL Developer, thus a little bit of hacking is required.

Close SQL Developer. This is important. If you modify the scheme file while SQL Developer is open, your changes won't be saved.
Locate file dtcache.xml in the SQL Developer's settings directory.

Windows:

%APPDATA%\SQL Developer\systemn.n.n.n.n.n\o.ide.n.n.n.n.n.n.n

Example:

C:\Users\dracula\AppData\Roaming\SQL Developer\system3.2.20.09.87\o.ide.11.1.1.4.37.59.48

Linux or Mac OS X:

~/.sqldeveloper/systemn.n.n.n.n.n/o.ide.n.n.n.n.n.n.n

Example:

~/.sqldeveloper/system19.1.0.094.2042/o.ide.13.0.0.1.42.170225.201

Locate <schemeMap> tag inside dtcache.xml file. Insert the content of the color scheme xml file inside <schemeMap> alongside the other colour schemes. Be careful not to break the XML.

Insert the contents of color scheme xml file after opening schemeMap tag

Launch SQL Developer. Navigate to menu Tools->Preferences, then select item Code Editor -> PL/SQL Syntax Colors in the left pane.
Select theme in the "Scheme" drop down list on the top.

See original instructions providing by Ozmoroz

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