It all depends what stage of your life you are on at the moment(what will be more practical for you). If you are single and have no kids, your corner sofa bed can be in light colour and fabric does not really matter, you can go for whatever you want, as long as you have no pets. In case you have pets, it would be a good idea to fo for leather or eco leather, simply because dogs’ or cats’ hair will not stuck in the eco leather or leather. It all changes when you have kids. The most practical colour for your corner sofa bed would be something darker like brown, dark grey or black. Then material would be complitly your personal choice. I would say that leather and eco leather would be better again, becauae it is easy to clean, but then again it gets cold in the winter. I guess that fabric would be good too if you are not planning to feed your baby on the sofa, then it would be probably fine! On top of the practical side of the chosing a colour and material of your corner sofa bed, you need to think if it will be suitable for colours which you already have i your room. In this case it will be probably best to go for neutral colours, earth colours like brown, grey etc. I hope this is helpful and will help you chose right colour and material for your corner sofa bed. It would be a good idea also to look at a guide how colours influence our mood etc. Thank you.