In this strategy you will have to drop below 200 cups and, well, as you may know, you may get good bases. I'm not talking about 200K+ bases, but about 50K bases you can raid with 1 giant and 20 goblins, with exposed storages.
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Minimum Troop Housing Space Required: 185 Minimum Spell Housing Space Required: (not specified)
Find a base around Town Hall 5-6 with exposed or half-exposed storages and 50K+.
Drop in a giant or two and 20-25 goblins.
If needed, drop in a healer to help giants get through a wall or, if you prefer, 1 or 2 wall breakers.
If you're lucky enough to even find some DE, throw your Lightning spell at it right away.
Keep repeating until you get good results. I got 3 million gold per hour. That's 30 level 7 walls an hour! Crazy, huh? Well I played straight for 1 hours and got 3 million in total, farmed all of my walls, and put my TH to upgrade to 8.
That's pretty much it, once you get the trick and get to TH8+ you'll definitely miss this kind of farming. Good luck!
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Definitely the best farming strategy for TH7, my friends got shocked when they visited my village and 6 hours later it went from all level 6 walls to all level 7 walls.