Well its kinda hard to speculate on this as tons and tons of ico is coming and it is really hard to identify which will took over the trend.

The most massive coin i ever hold which pumped is pesobit

I got it from the pesobit bounty campaign

Initially the price of ico is 300, Days later price is pumped to 10k

which is a total of 10,000/300 = x33

Its a massive pump

Well usually if you are looking for coins which you want to have x100-1000 returns

Look for this criteria
1) Low marketcap , 21Million + - 50Million is still okayish
2) Stable development - Look at belacoin, initial price - 30 satoshi where its for the chess games, you will never know there will be such successful now where the price is now 12322 Satoshi each which is almost x400 in 1 year time.
3) Huge demand / Trading volume on it
4) Unique ideas

Good luck!