Styles don't come much bolder than the Ruby Graphite FMX Style, especially on Linux when it's used with FMXLinux, now available in Delphi 10.3 Rio. The red accents of this style make a striking statement in any project.
Using Ruby Graphite is as easy as opening a TStyleBook and selecting it from your Styles folder:
Here is a sample of the Ruby Graphite FMX Style on Linux:
Ruby Graphite looks great in other environments as well. Try it in Windows, iOS, Android, and macOS in addition to Linux.