If I were you I'd consider a rug that has the neutral tones but also something that has a bit of colour that you can use for inspiration to then pull out for cushions. Remember browns can be cool (blue/grey) or warm (orangier). It looks from the picture that the browns in the pic are warmer so i would go orange/magenta. Keeping in mind I know nothing about your style or colour preferences, I put together this visual to give you an example of how you could work it by pulling out colours from the rug, using texture for interest and mimicking the circles in the picture to bring it together. You may also be interested in reading a blog I wrote a while ago about how to pick a colour theme that works.

Hi there, I would be inclined to bring the green inside to complement your foliage outside. I can see you have a patterned cushion with some green on it. If you decide to buy the cushions and you like the patterned green one, simply take the cushion along with you and try complementary colours. Maybe teal or lime to lift the sofa. Green is fairly timeless and you can enhance with a lovely indoor plant. Have fun.

I like the triangular pattern and stag head, however the teal does not seem to blend in well with the dining chair covers. You could try matching the ochre colour in the triangles in the plain cushions.

Care InstructionsSpot Clean - Professional Clean ColourBlack, Grey, Blue, Natural White & Copper MaterialsMade from 50% Wool, 30% Viscose, & 20% Cotton Backing material Cotton This one on Brands exclusive