Easy living room makeover

My living room is somewhat of a halfway house. We have furniture that is in good condition so it would be uneconomical to throw out... but it's not particularly to my taste anymore. The room also has many functions - playroom, TV watching, listening to music, reading and it stores all our books so it has to be functional. It has windows opposite each other looking to the front and back so has great light. The walls are cream and there's a nice-ish laminate floor so the basics are also good.

So far, it looks like this:

Two black leather Klippan two seat sofas, four Billy birch bookcases (the bottom halves have doors) and one half size bookcase, a Fado table lamp that I've just re-introduced to the room (all Ikea). Green faux silk crinkle cushions in green and red (both Next). What you can't see is the large and old TV, a Moroso black leather tub chair,the big black floor cushions and charcoal wool blanket (everyone needs a snuggly) and the two tubs of toys plus a pair of parked toddler ride-ons. Dull, hmm?

What I would like to see is this:

Lightened and brightened, keeping the curtains but do something to the tiebacks which are badly made and also actually hang the second pair. Keep the sofas but get them covered with white Panama cotton Bemz covers - I think the covers would work well even in a child-friendly household as they're washable and perhaps could be bleached if they got too stained. I want to switch out the green cushions and red cushions for a lovely yellow damask print and the green print cushion looks light and fresh too though I'm not sure they would work together. The white ribbed vase reminds me of a similar one on SATC Carrie's windowsill, except these are £1.49! I know this orange pintuck cushion might clash, but alone on the tub chair it should work? Maybe add a small coffee table as cups are currently put on the bookcases but I haven't found one that I like yet and also the TV's picture is going so the monstrosity may just have to make way for a slimmed down version. And lastly, can I squeeze in a rocking horse?