It's a huge 4 seater with a sticky out bit on the end, a big soft thing that is all out of shape and dark. We can't afford a new one just yet so I'm thinking how can I revamp this one?! It's dark grey with red cushions, ideally I'd like the cushions be a bit of yellows and greens but the cushions are big and difficult to get covers for. Can I just replace all the cushions with new smaller ones but plenty of them?