Usually, at least it's what we do with our enterprise global program New², we have a contest of the best initiatives for the company program.
This is a good practice because it enables to map what the company has achieved and also provide recognition to the individuals who are the most commited to the company change.
The problem with this setting, is that we are rewarding past efforts and not funding initiative who may make change happen more drastically.
We should have another complementary setting: a directory of just starting initiatives.
How this list of "Promishing initiative for the program" is "managed" and the interaction it may creates (like this people may participate to some of those initiatives, as they are known in a central directory) needs to be carrefully designed.
It should allows for emergence and in the mean time provide the right level of quality the company program is expecting...