I don't understand what people are doing on turbo trainers to get bored!
I can't see much point in getting on one and messing about for hours, so I would only use one when I wanted to pack a lot of effort into a relatively short period of time and in that case I would be too focussed on what I was doing for boredom to be a factor.
Quite right. Unlike being out on the road, you don't have to worry about saving enough energy to make it back home so you can really flog yourself in a short, intense session. As others have said, find a GCN video and just go for it!
