What Are the Easiest Thanksgiving Break Projects to Do with Kids to Earn $1/day?

A few years ago on a weekend break, I wrote a single-page product review with a domain registration and keyword mojo that soon earned $1/day in referral bucks. It died due to Amazon sales tax policy kicking me out of the affiliate program.

Since there's a long Thanksgiving weekend coming up, and I'd like to re-create for my kids that thrill of doing something small that produced measurable results.

What are the best pico-options for teaching them the thrill of pico-entrepreneurship with only a keyboard and their minds?

The $1/day is arbitrary--mainly just looking for how they could learn how to convert digital effort into measurable financial results.