One of my favorite things is to integrate locks into bags/accessories that don't normally have them:
Brass lock hung with scrap brass clip from a necklace off the end of a pochette accessories nm:
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Brass lock hung off the zipper of poche documents using a very very small brass key ring:
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Second pic of poche documents w/ brass lock:
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Sac plat is one of my favorite bags, but front/back is so plain. Added a lock hung off the handle hardware w/ scrap of an old brass chain:
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Second pic of sac plat w/ brass lock:
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Really love the last lock look! How did you hook the brass chain to the handle?