what software do you use? I've been wanting to learn how to make concepts like this for ages but I have little experience with the different software available. Haha and this is amazing by the way!
I used Photoshop CS3 for this. I recently just upgraded to CS6 but it definitely uses up more cpu than CS3 version. I also use a Wacom tablet to paint in photoshop. Makes it a lot easier than using a mouse!