The phrase "whimsical design" refers to a type of design that is playful, imaginative, and has a touch of fanciful or magical elements. Full definition
For example, you can't expect experienced professionals to show interest in eLearning infographic templates with whimsical designs. (elearningindustry.com)
We also love the cute whimsical designs and bold colors that transform these stainless containers into child - favorites. (mommyscene.com)
I like whimsical designed bedding for winter to brighten each day. (garnethill.com)