You've got a neutral base there so tons of colours would work. You could paint the walls - either go for a feature wall with something bold like a teal or olive green, or paint all the walls something paler like duck egg or apple green for example. Or you could add pattern and colour with wallpaper. Pull a palette together of 3 colours to add visual interest. Work on a 60%, 30% and 10% rule for the different colours. For example: 60% neutral, 30% would be accent colour 1 (so paint a wall or bring in wallpaper or add a big rug, some cushions and art), 10% is accent colour 2 which could be a few cushions and decorative bits.

Thank you both for replying. Yes Minnie101 you have the photos the right way round and that is the AA, good spot! I've just painted some AA & Bowler Hat on the wall, once it's dry I'll add it to the post as that really isn't the best photo you're right. Yes the eclectic design will have a lot of colour, I have a dark red (very close to ox blood in colour) leather sofa which would stay for that scheme and I'm thinking of adding lots more colour with artwork from artists like Patrice Murciano like the one here & adding the exact rug here which will cover most of the floor.

I'd recommend a lighter colour throw and a matching footstool.

I agree with the above. Is it your preference not to be too different or is it actually a rule for your house/area? "in keeping" is a very subjective term. A house is in keeping as long as some elements like size, proportion, colour, material are reflected elsewhere. I would say your houses are not "in keeping" but identical. I agree with @Barbara in that if you make a big change that looks beautiful other neighbours will follow suit.