Interiors - Children's Bedroom Inspiration

When my marital home was sold and I bought my own place I had to downsize considerably. Practically I just couldn't afford to maintain a house of that size on my own... the heating and electricity bills were crazy for a start. I'm sad to be in a smaller space with less impact. Interiors are one of my things... I just love interior design (I even did an evening course in interior design when I first moved to Glasgow). Although that said, it probably was good for me to move on and have a fresh start. 
I'm conscious that the kids rooms are really small. The littlest is in the smallest room. I know it's not a competition, but at their dad's house (he's recently moved into what can only be described as a mansion) the kids both have en-suite bathrooms... and the littlest has pointed this fact out to me a few times now! At mine we share the one toilet (which can be a right pain at times!). 
Anyway, I've been giving some thought about making the best use of the space that I do have, and I think it's probably time to sell the bulky single beds that I do have and invest in a cabin bed or midi sleeper of some sort. This way I can store plenty of her things under the bed and give her as much floor space as possible. She is four now so I think she's probably safe to be on a raised bed now so long as there is a barrier.
Unfortunately this bed is £2,330 at bobo kids!! But isn't it fab!
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This then got me day dreaming about all the other interior touches that I could add to make the space beautiful, and of course I've been pinning like crazy!!
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What is your favorite interior find that you have in your little ones bedroom (or yours for that matter!)?