Mine is helicopter seeds 
I just spent a productive half hour standing in the garden flicking them over the edge of the patio (which sits about 3 to 4 feet higher than the lawn, so makes a cool launching platform). I've discovered that if you position one upside down (sail/wing pointing down) on your index finger, using forefinger and third finger to hold it in place while "cocking" your index finger with your thumb, then release at a high angle of attack rather than horizontally, you can get a reliable boomerang effect, which is even better, because you get multiple goes from the same seed!
The only downside to helicopter seeds is that they're seasonal
What's your favourite? It can be anything naturally occurring or "crafted" from natural materials, but remember that finding joy in simple pleasures is a virtue, so the more hard work that goes into preparing your toy, the less fun it is by definition!
I just spent a productive half hour standing in the garden flicking them over the edge of the patio (which sits about 3 to 4 feet higher than the lawn, so makes a cool launching platform). I've discovered that if you position one upside down (sail/wing pointing down) on your index finger, using forefinger and third finger to hold it in place while "cocking" your index finger with your thumb, then release at a high angle of attack rather than horizontally, you can get a reliable boomerang effect, which is even better, because you get multiple goes from the same seed!
The only downside to helicopter seeds is that they're seasonal
What's your favourite? It can be anything naturally occurring or "crafted" from natural materials, but remember that finding joy in simple pleasures is a virtue, so the more hard work that goes into preparing your toy, the less fun it is by definition!
