I found this flower growing among others that came from a packet of seeds titled "wild flowers". I haven't seen anything like it. I can't wait to see what it looks like when it opens up, if it opens up. Anybody have any of these and/or a picture of a mature one?
Ditto--definitely an Eschscholzia californica. It's an annual, so what you have is mature. These reseed every year, so you'll be able to see more of them every year! Here's a picture one from my yard that I took recently. I scattered a packet of mixed colors, so I've got lots of variety, including some like yours. I don't know the specific cultivar though, sorry.
There are many types of these that are perennials too--I'm not sure if they would be hardy for you in zone 6, but for Vicki in zone 8 they probably would be. There are some annual types too, if we can get a picture of it once the bloom opens maybe we can figure out which one this is and know whether it'll be a perennial or not.
I think it's a common misconception that they're annuals--I used to think that too until I started collecting CA native plants for my garden. I'd always loved the look of the poppies but since I hate annuals I never considered them. Then I went to a nursery and found there were a few kinds were labelled as annuals but most of them were perennials and I was so excited! I'm still not sure which sort Vicki has--most of the pink/purple ones that I've bought in the past have been the perennial sort so hopefully that's what hers is. In zone 6 they'll probably all be annuals though :-(