RISC OS has always been very open and expandable but for a long time the default UI, although extremely powerful, looked dated.
Whilst it still doesn't offer the slickness of some user interfaces it is possible to customise a number of different aspects.
This section contains a theme manager and some themes.
Skinny is a theme creation application that lets you define the look of RISC OS including the furniture around the windows, general desktop sprites, file and application sprites and other window manager settings.
Green is a theme providing light grey furniture with green controls.
Modern is a theme based on the classic RISC OS look and feel with a more modern look.
Raspberry is a theme providing light grey furniture with red controls.