I think the perfect balance in a colour scheme is 60%, 30% accent colour and 10% second accent colour. So your 60% are the neutral tones in the room and the green is your 30%, I would add a touch of another colour for your 10% to add interest and break things up. Couple of cushions, a vase and other decorative accessories really. Pinks and purples go really well with that shade of green, or you could even go burnt orange.

Oh! Thanks sooooo much, AJ Interor. I was worried I'd bought the wrong colour - yet again! I can now rest easy, until the next project comes along. Incidentally, what do you think of a light green sofa, (sofa throw actually), against a delicate terracotta wall, please? That would be for the opposite wall to the fireplace. I'm hoping the lush green (by fireplace), will worth with a light terracotta opposite. What are your views please, or do you think I spoiled paint both walls in the same green?

Can't see enough of the rug to tell......................it looks like an off the shelf carpet that has had it's edges bound so as not to fray. Most independant carpet retailers that i use already offer this service, i don't know about the bigger retiailers. You can choose any carpet and they'll bind the edge, and also put webbing on them if you so wish, it's most common use is for stair runners, but the technique can be applied to any size carpet.

I think you feel it looks too solid is because you haven’t followed through with the rest of the room, for example cushions to tie in with it. Further up these comments minnie101 has suggested some black patterned cushions which i think would lift the scheme, however if you really don’t like it then follow your heart and return it. Why keep something you don’t like? Then choose a colour-way that you prefer, such as the blue you suggested. A blue coastal theme would tie in nicely with the neutral theme you have at the moment. By the way, i got a Turkish rug from Olney Carpets in Bucks, and they let us take it home for a week to see if we liked it before buying! True service, and yes we did buy it! Of course buying online does give you that option too. I wish you lots of luck.