Topshop, River Island, New Look & Miss Selfridge look like they've been drenched in cotton candy, and decorated by a 5 year old girl, full of pastels, gingham, floral, lace and crochet, nostalgic (70s bright and block) , child-like (eg; cars, mermaids, shells..) ditsy and polka-dot prints, as well as the odd pair of sequined hotpants and bandeau crop top.
One of the style icons this trend makes me think of is Brigitte Bardot (above). I love the huge hair-beehives and ponytails, bows and headbands, high waisted shorts, crop tops and ankle jeans/bottoms. (Lana Del Rey & Marina Lambrini Diamandis from Marina & The Diamonds also appear as if they look to Bardot for inspiration).
It also reminds me of Meadham Kirchhoff's Spring/Summer 12 collection, which I reckon would've been a BIG influence of the sudden popularity of cute, cartoony nail designs and dip-dyed hair!