SUISkin is the easiest-to-use VCL skin component for Delphi & C++Builder. It provides you the ability to make skin-supported application automatically. You will never spend many time on programming skin supports.
Using SUISkin, you don't need make any modification for your existing projects just drop the skin engine component onto the main form and set some properties, that's all. It can skin all forms in one application and dialogs automatically. And the skin files can be compiled into the EXE file so that you don't need distribute the skin files with the EXE. At run-time, you can switch the skins very easily and you can switch to unskinned easily too.
http://www.sunisoft.com/suiskin/