I have been trying different mediums lately, and watercolours are one of them.  I'm no watercolour expert, but it is a good excercise to put paint to paper once in a while.  I often think that one medium informs another...working on small detailed pieces, helps me focus for working on bigger pieces.  Just like making banana bread (from the previous post),  is just as much a creative process as building something, gluing, or playing with wire.  I like to mix it up so I don't get bored, but infact the mixing part is what keeps me going, challenging me to the next and the next.  How else would the world have new ideas if artists/designers/engineers didn't keep coming up with them?