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Circle-based crochet items are a great way to build a project of multiple radial symmetries around a central point.
They are wonderful for covering a portion of an area without obscuring the entire surface. For example, as a blanket, they highlight and counterpoint the bedspread underneath, or in the center of a near-square room, to let the young-one have a central point to focus and play on. The really attractive feature is that they break up the lines of an otherwise simple stitch, and allow you to make an interesting project without having to learn a whole slew of new stitches.
Rainbow Ripple Baby Blanket Free Crochet Pattern
The Rainbow Ripple Blanket is a beautiful example of how a circle-based pattern can be modified by using straight lines in radially increasing chevrons. This makes a symmetrical starburst pattern that is further accentuated by the layout of the voids and the color bands. This would make a great blanket for keeping the little sprog off the floor during playtime.

More info about this project here.
Rainbow Ripple Baby Blanket
Beautiful blanket as a baby shower gift, but pattern can be easily addjust to bigger size if needed. Unique shape and great hues make this blanket perfect for any baby girl or newborn. You can pick up your favourite colors to match your child outfit.
Skills: Easy Yarn: Berroco Comfort Solids & Heathers Designer : Celeste Young

Rainbow Ripple Baby Blanket – visit the free pattern site. More datails about yarn you will find here.
Spoke Flower Blanket Free Crochet Pattern

The full article about this pattern is here:
More info about this project here.