Idea is to add a mural or some pictures on the wall left of the bed, perhaps even decals. I've purchased a solar system decals from Target, but they were not peeling or sticking so I had to return them. I also purchased some really nice blueish frames from Home Sense, but was thinking of adding something a bit more dramatic instead even though the painting of hot air balloons there already dramatic enough.
I definitely enjoyed creating a tree mural in my son's nursery (in our previous house) and was looking forward to creating another one again.
In terms of inspiration, here is what tickled my imagination:
Perhaps a simplified version of one of these, albeit with different colour palette.