A friend is currently having a pool installed in Northern Tuscany and has opted for a very dark liner almost black. We have a pale blue liner - it looks great at night with the lights on and its easy to spot any dirt too. Depending on where you live - Spain or other locations, you might need to check with your local council to confirm if there are any issues with different coloured liners. I know in our case it had to be blue in our part of Italy. Take your time - pools are expensive so you want to get it right.

How exciting! Its funny how deep they look when there is no water in them. When you fill it with water it will seem much shallower. First on some practical points the radiator is a slight concern. What you really need is a small air handling package that is linked to the water temperature and that will ensure the air in the pool house is always a couple of degrees warmer than the water in the pool and is circulating to avoid condensation. It would be good to identify who installed the pool (There might be labels on the pool plant) and to get them in to overhaul and recommission it. You could replace the sliding doors with really good quality (Schuco) sliding folding doors so that the whole lot could be opened back on a sunny day. You could get rid of the radiator and make those windows into full height doors as well. The brick walls are a bit sad - but would be a great surface for fixing slate, stone or tile, and for the floor you could look at a non-slip ceramic porcelain large format tiles. We use Solus Ceramics. http://solusceramics.com Lighting is always tricky - if you put lights in the ceiling over the pool it can be hard to change the bulbs. We have got round this in the past by using fibre optic projector lighting (One central lamp and the light is conducted along inert glass cables to the fittings) but it is quite an expensive option, or instead uplight the ceiling using floor or wall lights. In that case you have to think about what it is that you are uplighting - That acoustic tile ceiling belongs in an office - I would love to replace it with a timber ceiling which would be worth uplighting. http://www.universal-fibre-optics.com/pool-and-wet-area-lighting-projects What part of the country are you in?

The pool man was going to leave it like this. then he said could cover the blocks with mosaic tile. But I think the gap is too big and I don't like the blocks. so he said we can add extra marble and stick it underneath the present marble OR add 2 squares of the mosaic tile underneath the present marble , so the gap is less ,but I think I 'll still be able to see the blocks.

Concrete sidewalk tiles? Non slip, durable, affordable, neutral color.