Hey,
I've been doing quite a bit of low-cost lighting in the garden recently. I use spike lights which can be mounted on walls or on spikes in the ground. They take GU10 mains voltage bulbs and you can put whatever bulb you like in them, as wlel as add gels easily to the lights (gels being the correct term for coloured or frosted films)
THe fittings I use are these:
http://www.ebay.co.uk/itm/291038206...49&var=590202050351&ssPageName=STRK:MEBIDX:IT
be careful as you can get very badly ripped off buying these from the likes of screwfix, wickes, etc. they charge upwards of £20 per fitting and I've seen them as high as £40!
I've bought loads of these now and I'm very happy with them - no issues at all. they work out between £7-8 per fitting
Bulbs:
the ones along the back of my house use LED hut's 4.5watt GU10's they're on a daylight sensor and are active all of the time.
My preference for the perimeter lighting is Screwfix's 5 packs of GU10's. they're 5watt, daylight and very nice. They're currently £19.99 per pack of 5 , so at around £4 each they're very reasonable for their quality. you can't buy them on their own mind - packs of 5 only!
http://www.screwfix.com/p/lap-gu10-led-lamps-346lm-5w-pack-of-5/2299g
Cable:
I use this
http://www.toolstation.com/shop/p17796
as it's weather proof, and is fine for the very low wattage of LED lamps. The fittings themselves cvome with 2m of rubber flex too so you don't need much.
Junction boxes:
http://www.ebay.co.uk/itm/261881893834?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
I prefer these JB's. they're a bit pricey but there's no messing on with cable glangs etc. they're IP66 and so quick to use. I also use wago connectors inside of them:
http://www.screwfix.com/search?search=wago+222
to make the joins. dead easy!
for the cables in the ground I have them all going through 22mm round conduit and elbows etc. Everything is RCD protected, and fused witha 3A fuse, but it's just to protect the cables from anr stray mechanical damage.
here's some pics:
^daylight LED hut 4.5watt GU10