Budget space age: 1960s-style Koziol Orion pendant lights
There are plenty of original 1960s or space age light fittings on eBay, but they rarely come cheap. These Koziol Orion pendant lights aren't from that period, but they do offer the look - and cheaper than you might think.
These colourful spherical lights are made of plastic, which probably trims the cost down. But as plastic was 'the future' back in the 1960s, it probably adds to the period feel. Your visitors will just presume you've got vintage with this!
There are various colours available, with the lights working well as standalones or in parsed or clusters (as you can see above). Each one sells for between £49.50 and £57.90, so not a huge outlay (compared to designer lighting) if you do go multiple.
You can get them at the Made In Design site or at Red Candy, depending on the colour you require.
Update: You can also get the design as a floor lamp too.