bitcoin is quite low due to all that MtGox panic, so this may be
Otherwise: any new coin. Although it is:
risky - coin may die or become close to worthless
difficult - you have to understand cryptocurrencies to at least guess its possible potential/usefulness/inovativness, to verify its claims, like checking for hidden premine/instamine, ... many coins have different stated (calculated) and real coin cap (incompetent dev that can't do the math right
), or to discover possible coin flaws (to stay from that one out)
But if done right, there is a chance for some pump and dump profit.
