Not diy, but I get the decorative led string lights off amazon.com. they run off of a cr2032 battery, are 6 feet long and I can get a 10 pack for less than $20 usd. The battery pack isn't waterproof, but the light string is and they are stupid light. Not super robust, but if you are reasonably careful with them, they hold up well, and are cheap enough to replace as needed. They're generally not bright enough to read by, but plenty bright enough to help find your rig in the dark from a distance, and to find stuff and/or change clothes in the night.
www.amazon.com/gp/aw/d/B01M1LZS1K?psc=1
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