You could try going into Create-A-Style while in buy/build mode, then things will match.
Thank you Sherin, but it's not the colours that annoy me, (except the red brick chimney), I change the colours of almost every wall, covering, furnishing items and even things like taps all the time. But, you can't recolour the chimney, its either red brick or the one with the grey brick that looks more like a basement boiler than a lounge fire, or the swedish style with the metal chimney which catches the house on fire with annoying regularity. I can't afford to own every EP and stuff pack, so I did not know that there was a modular curtain system with MS. Can you also raise and lower them to fit the window? The curtains, like the windows are all different hights, lengths and widths. The Doors, apart from one or two, no matter how you recolour, there are no windows to complement them. The windows are either too high or too low to suit, or there is not a suitable single width window to match the main double or triple width window. I find all my houses are created to complement the few complimentary sets available. Stair rails are also a problem for outside steps, there are a few matching sets, but none for my favourite fencing. I'm a bit of a perfectionist, I suppose, but, I would not be happy to have a mish-mash for my home, so don't like having to compromise with a mish-mash for my sims homes.