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Delphi and C++Builder 10.2 Tokyo come with 39 VCL Styles available in the folder (with a standard installation) at C:\Program Files (x86)\Embarcadero\Studio\19.0\Redist\styles\vcl\.

Embarcadero provides an additional eight premium styles that are available in the VCL premium style pack: https://cc.embarcadero.com/item/30492.

Moreover, it is possible to create your own styles or modify existing ones using the Bitmap Style Designer. You can access it by going to Tools | Bitmap Style Designer Menu.

For more details on how to create or customize a VCL style, visit http://docwiki.embarcadero.com/RADStudio/en/Creating_a_Style_using_the_Bitmap_Style_Designer.

The Bitmap Style Designer also provides test applications to test VCL styles.