Just come across an artist by the name of Sammy Hall whom does spectacular concept artwork for all sorts, especially that of beloved video games :)
REALLY like the designs he did for Donkey Kong Country Returns, in which my imagination has been put to shame visually in all honesty haha.
Please stop & take a look at his blog 'Sketches And Thought Experiments' got some brilliant stuff on there.
Below is are some of my favourite pieces of the Donkey Kong concept art...
Especially liking the Barrel factory!