Princess - I know a Princess (in college) and she goes by her middle name, Elle. Not sure how she feels about it. To me it's strange but I didn't think about it much.
Pixie - Naming a baby girl Pixie might turn into an awful mess. It would only work if she was super tiny. Imagine if she wound up 6 feet tall or chubby, it would seem to add insult to injury. Talk about irony.
I like Poppy okay.
Isla - how do you pronounce it? I've heard different versions.
Lily - very simple, but pretty. Not too unusual though
Daisy - same as Lily only less usual.
Gracie - pretty and sweet but normal almost to the point of cliche. I do love it for a middle name though. It seems to go with anything.
Izzy - I love this as a nickname for names like Isabelle, Isabella, Isadora, etc
Ruby - I'm just not a fan of Ru- names, Ruby or Ruth or whatever
Mimi - Reminds me of Mimi off The Drew Carey show, so not my fave
Mia - simple and cute
Summer - bright and sunny
Millie - Plain, but not terrible
Freya - this is maybe the most unusual and I like it because of that
Lola - Great now I got that song in my head. L-O-L-A Lola la la la la Lola. I don't hate the name though.
Maisy - only like it as a nickname, but it would be a cute nickname
Betty - I think this was an aptly picked name for the Ugly Betty show. Take from that comment what you will.
I like Summer Grace as a combination.
Some from my list:
Seraphina - like an angel
Mae - like Mae West, who was one cool chick
Claire - it's a classic
Joelle - it's French and tres chic
Rosalie - despite the Twilight character, I like this name. it's so sweet.
Naomi - Naomi Campbell, Naomi Judd, Naomi Watts, nuff said
Lorelei - I love the nickname Rory, from Gilmore Girls. Plus it's beautiful on it's own.
Gisele - Again French and gorgeous
Good luck, hope I helped :D