We can do it in white colour, I guess : >ответ<
I won't give the answer yet. Tell me is it too hard or too easy that noone answers?
Just for example, here is a riddle from British version of this game:
This horse never goes out during the day, but it can easily wake you up.
I've found the answer rather quickly though I'm not a native speaker. I assume my riddle is not much harder, so give it a try!