I'm not a professional landscaper but as a parent I actually disagree... Gardens for kids need to be somewhere to stimulate the imagination and dream and play. Don't kids always have a ball exploring their grandparents gardens? I would go for large leaf plants that create secret hidey cubby spots under the foliage, fragrant herbs that can be brushed up against. Ornamental grasses with big seedy stalks, Bright cheerful flowers that can be picked for all sorts of potions. I would recommend NOT making your backyard like a playground, because that takes the joy away from trips to the park. All the different levels are great for adventures and imagination. Don't make it too safe... those rocks are EXACTLY where your kids will want to walk along and perfect their motor skills and balancing and risk assessment skills. They won't get into too much danger in your backyard. You could terrace the slope and plant into it with herbs and some kid friendly plants like herbs, lettuce, cherry tomatoes, strawberries. Then down the track have more grownup choices. Also plants that will attract birds, lizards and other wildlife for the kids to enjoy. Large bushes like grevillea and bottle brushes -you can get groundcover rambling ones on these also- they will attract beautiful birds like rosellas which the kids can enjoy. I would go for a garden that can be discovered and explored and let kids imagination take over. You want a garden that can be a castle, a pirate ship, a rocket, the moon, a fairy forest, whatever! As far as actual play things, Use logs or stepping stones through the garden beds to protect the plants from being trampled. Don't make paths through, but space them randomly so the kids can go any direction. A few areas with river pebbles... nice round smooth ones in different colours, that can be stacked and played with will be endlessly entertaining. Don't underestimate the fun and joy of sticks and stones! Logs in alternating heights through the garden bed will create a great rambling obstacle course to balance on. If you want to go there, maybe add a slide down the slope of the hill next to the step. Or a secret pipe for sending cars or messages down. There is a great toy called sticklets that can be used to connect larger sticks and branches to make forts and cubbies. But its not really necessary. A lot of those play equipment sorts of things are just too rigid in the way the kids can use them. Kids need a little space, and lots and lots of wild and green! This website has some awesome ideas! http://www.letthechildrenplay.net

I'd agree with adding darker colours to the mix... if reupholstering things is not in the budget just by adding chocolate, charcoal or navy blue to the chair and bedding will help. Add some rougher textures, chunky knits, pin stripes, vintage linen and right on trend velvet.... Adairs have a sale for another couple of days on their linen and other products https://www.adairs.com.au/search/?q=Vintage+washed+linen Accessories to consider are things made of dark marble, timbers, geometric shapes and gold... A bold feature wall could give some mood to the room again in the above colours.

I would choose a light, warm colour for the walls. If you are uncertain what to use, you can pay for a colour consultant will go to your house to put forward their recommendations. According to their website, Dulux charges $150 for this service. I think it's worth that amount if undecided on colour. I love plantation shutters, however, with the extra large windows and doors in your house it would cost a lot to install them. Alternatively you could use layered curtains or insulated curtains. Use heavy fabrics or layered curtains over the windows to keep out drafts. Or, purchase insulated curtains with built-in thermal backing. Window pelmets are also good for keeping out the cold.

For me, it would be colour. Maybe a feature wall for walls around dining, or living, pick colour from your favoured painting, and use same and other colours from pictures for cushions or even some occasional furniture in the brightest colour - I saw this done beautifully in a tarted up house for display - a small seat/coffee table painted and upholstered in an orange mix, which was taken from the splashback (everything else was neutral) and also in a throw for lounge.