Sign a message from your bitcoin address for the byteball distribution. You will get a small drip feed of coins at the full moon of each month provided you don't move your bitcoins.
I second this. There's also Bitcore which you can redeem instantly. Can't remember when the snapshot was taken but you get the equivalent in BTX that you had in BTC at that moment.
Stellar is doing a giveaway of 16 billion thingies based on BTC balances on June 27th.