I found these things in my garden, they look like a flower but I don't know where they came from. They are flat and the base looks like a calla lilly base but they are not. Here are pics
Did you grow onions in that bed last year? Hard to tell until it flowers, I think, but it certainly looks like something in the traditional lily family, which would include onions. Simple test for that one - break off a bit at the end of a leaf and give it the smell test. You might like to wear gloves, though I can't think of anything in that family that is a skin irritant.
I agree with Daniel it looks onion like or maybe that large garlic that is often grown as an ornamental. Or did you have leeks there last year and maybe they went to seed. http://en.wikipedia.org/wiki/Salix_discolor is this the pussy willow you mean???? http://www.wildmanstevebrill.com/Plants.Folder/Cattails.html Liz
http://www.wildmanstevebrill.com/Plants.Folder/Cattails.html The third picture down looks just like it.
No, not cattails. Doesn't resemble it to my eye, but if you need a bit more evidence - is your garden on the edge of a pond or with supersaturated soil such that only pond plants grow? If not, a cattail wouldn't germinate and grow.