This section really is of a choice for yourself to make, It is said that your pond 
should match the surrounding pattern of your garden, with rockery stones, matching timber decking, seating areas, paving and walk ways.
The style really depends on what garden style you have formal ( straight edged manicured shrubs and lawns), or informal ( curves, rockeries, overhanging plants and shrubs).
The style depends on what you really want, and is therefore of a personal choice, there are many products available such as pond lights illuminous fountains and water features that will look great in the right pond, but will stand out like a beacon for the local airport to land their planes on. Its a matter of what you like after all its your pond and your garden.
Reading up on gardening books can help you in the design of your pond, and if you have a bare wall to wall lawned garden the designs possible are endless. Materials can be sourced from a wide range of outlets and this sends us back to the planning and budget section, Its all a matter of what you want and can afford when building your pond.
One important aspect of pond style aslo reflects on the fish you wish to keep, for instance sturgeon do not do well in planted ponds as they cannot swim backwards they have often been found stuck and tangled up in waterlilies and oxygenating plants. Most koi ponds are left unplanted however many people plant them up if the style they chose to have is what they want. Also it is often for koi pond owners to have a vegetable filter incorporated to the system to allow vegitation around the pond and gain the extra benefits of using the plants to aid in the extra filtration process. More on vegetable filters can be found here.
Pond building and maintaining needs to continue to be a pleasure, any aspect of the work involved that you do not enjoy will only bring you more work and regrets, it is best to get it right first. Often people say the liner used is unsightly on a new pond build and the temptation to hide it as much as possible using stones ( common in America ) should be highly discouraged. The liner itself will mature over time and as you can see in the above fibreglassed pond photo the natural coating that has matured over time soon hides the man made look.
