We have a queen and a twin pushed together and I think I have done a fairly good job of making it look as nice as possible. I hate having a hodge podge of mismatched blankets. I have tried really hard to make the bedding coordinated and I think I have been pretty successful. A friend was over the other day and thought it was one huge bed!
We have matching sheets on the both bed (off white) and dark blue dust ruffles on both beds (I would rather have the beds on the floor, but they are up on box springs and bed frames and we have only had a few kid-fell-out of bed situations...), dark blue pillow cases, one king sized off white comforter, two matching twin blankets both covered with sage green duvet covers.
I think it looks pretty decent. Too bad we hardly ever make the beds, but at least all the bedding looks nice in a big coordinated heap.