Whilst away from my laptop, I use a program on my iPad called 'Make Pixel Art'. I have used this app to make the station. It's limited, but it's a nice quick tool when you're on the go. In fact it feels quicker to use the pencil tool with a touch screen. Worth trying it out for small work.
DOTA2 has just become active on my Steam account so I'll be playing that tonight for a bit, and then when I return from holiday so I may write about that next time since it is now out of Beta. - oP