Mine were purple (my fav color), blue (his fav color) and white. The bridesmaids dresses and flowers alternated; purple, blue, purple, blue...and the mens tuxedo shirts matched their pairs dresses. And we were the white of course! It was beautiful.
if the wedding is this spring i would have the colors for some decorations and bridesmaid dresses and some other stuff be a coral with a soft pink if winter red and gold if fall tawny and if summer a mustard yellow and hot pink . if you really don't want to base your wedding on a theme of holiday some colors that go great together like ivy green and purple or red and pink. i hope this helps.
Lots of colors are nice for weddings, but it really matters to choose one fit for the theme of a wedding, some online shops can offer a color chart with different backgrounds, i've seen one at Gotopshop.com, the colors are wonderful really.