Garbage Ideas

ITT: Post those lame software development ideas you have in the ideas.txt that you are sure you will never get to try them out.

An OS based on a reflective OO language with an Erlang-like actor model. The default executable format would store bytecode, which would be compiled before execution, and the executables would also double as libraries, that is a paint executable would also expose functions for image manipulation accessible from other executables. And I'd probably end up making the language very Lisp-like.
A shame I know jack shit about OS design or language design :(