There's something about drawing outside that just opens up lots of ideas.
Giant cows take over the city,
Other interesting creatures take shape.
Drawing outside is one of life's great joys. Let me say though, that I highly recommend white boards for this activity. Because that way, if a breeze comes up you don't spend the whole time chasing your drawings around. And, let's face it, it saves some trees. So if you're sitting amongst the trees, I'm sure they appreciate it too.
Last week I got to hang outside with some students and just draw whatever we felt like. It wasn't too hot, the park was beautiful, and everybody just drew and drew.
So, try going outside! It really does give you - and your drawings - room to breathe. And if you don't have a white board, you can use a sketchbook - those are fairly immune to blowing away also.