Routine followed by randomness, followed by routine, and so on. That's not a bad idea :)

Maybe consistency means more of just one type of practice? If you work in the creative field, then I would consider going to a concert or exhibition, reading a book, talking a walk, as part of your 'work'.

If you're any kind of creative professional, then variety is the spice of your profession! That's a coherent idea that will lead you to chose a not very consistent routine.

And hey, all the best creatives are confused :)