Aquilegia, the only thing you could really confuse a puff ball with is an earth ball, these are very obvious as when you cut them open they are filled with a big black "stomach" of spores. Or possibly a stinkhorn in its beginning stages, they look like a big round white egg but when you cut it open you can see the gelatinous cap and shape of the "mushroom to be" inside.
A puff ball (there are a few different kinds ranging from common meadow puff balls which are only small, through to the Giant Puff Balls which can be mistaken for sheep!!) will be edible when it is white through and through and white on the outside as well (don't eat them if they are going brown).
Can fry them or put them in stews - they don't dry very well.
Ten x