Simple Bitcoin related businesses one can start:
1. Start your own faucet
2. Create a blog about crypto or technology
3.Start a Bitcoin forum Going to be hard because of Bitcointalk. 
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4. Start a faucet rotator/list and get profit from referral
5. Buy crypto related domains and sell them off
6. Day trading
6.5. Create a profitable robot to do day trading for you
Just some idea I came up with in 2 minutes. Hope you enjoy.
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1. Start your own faucet
2. Create a blog about crypto or technology
3.
.4. Start a faucet rotator/list and get profit from referral
5. Buy crypto related domains and sell them off
6. Day trading
6.5. Create a profitable robot to do day trading for you
Just some idea I came up with in 2 minutes. Hope you enjoy.
.it only easy from step 1 to setp 3
the rest will take time
It is almost never easy when you have to achieve something which will last and grow.
As for these suggestion there are fine on their own I feel like some of then are not good as business projects:
1. I don't know if faucets are profitable anymore, you will like amazing SEO skills to profit from ads, not so easy to do.
2. It is actually valid idea, but again, at first you won't earn anythint, and content of this blog will have to compte with all news sites like CoinDesk or CCN.
3. No, definitely not. I've seen many forums failed just because everyone is using either Reddit or Bitcointalk.
4. Building a Referrals network are not real business strategy.
5. Actually great idea, but you have to be fast, the best one are alredy taken.
6. Trading=speculating, not really business, more like a light version of gambling.