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As a main part of pass-phrase it is better to take any phrase, which is easy to remember for you. It can be rhyme from you childhood, or the best phrase from your favorite actor. Length should be not less than 5 words. More words is better.
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Add few special symbols to your pass-phrase. You can write them down, but is will be better to remember them, because some of pass-phrases are non-restorative. Because of the length of the main part of this phrase, special symbols can be repeated, like ####.
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Two parts, from step 1 and step 2 will give you very good, secure and easy-to-remember pass-phrase.