I gave some examples in a post I wrote: How We Should All Invest – But Probably Won’t (Newbie Guide)
However as Guyota says - it is such an open ended question, similar to “what car should I buy?”
I would start with a global equity tracker, as this will nearly always make up the biggest chunk of an ETF portfolio. Then add diversifiers (bonds/property) and potential return enhancers (Emerging markets, sector specifc, or even a small amount of individual equities).