Crystalin Marie is pretty casual- she has more of a preppy vibe but not too much.
Taylor Morgan from Little Blonde Book is the absolute cutest thing ever, and I love and want to recreate most of her look- she isn't over done and doesn't "wearallthethings" like a lot of them do which I like. She wears things that can actually work in my life and isn't in a cocktail dress all the time like some other bloggers are.
Kendi Everyday is another one that does cute casual stuff from time to time.
Alot of others I follow (which are a lot, lol) have become super over-done and I'm on the verge of unfollowing.