Support for GDI+ rendering
Starting from version 2.0 (VCL) the IconFontsImageList supports GDI+ rendering to draw perfect Icons with transparency. The support is available from Delphi XE6 to actual version.
Look at this example to see the difference in a High-DPI application with classic "Windows" style:
With GDI+ you can also specify Opacity and DisabledFactor to control the rendering of the icons.