(We had to buy the big gallon sized miracle bubbles. That little bottle that comes with it wasn't going to last 20 minutes.) I really like that brand, by the way. The super cheapo stuff is so frustrating sometimes. We paid $5 bucks for the bucket of blowers and $5 for the huge bottle of bubbles (on sale) and I know you can make bubble solution cheaper, but I knew I wouldn't. So there you go.
For the last couple of weeks they've regularly asked to go in the backyard and blow bubbles on the patio.
And of course, you also have to chase the bubbles across the yard. Simple pleasures.