Remember that avocado pit you put in water in kindergarten? Learning this skill was more practical than you thought. Many plants can be propagated by placing cuttings in water. And while they're doing their thing, you can enjoy them by placing them in pretty glass or ceramics and set out in a sunny spot. Keep the water level up and rinse it out when it gets murky.
I like to add garden pebbles to give babies something to rest on. Mosser Lee sells bags of stones in a variety of colors and sizes. I like their White Polished Stones and their River Rock Soil Cover.*
When roots are well established, plant the cutting in soil.
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