You might try Purl Soho’s Knit Four Point. I’m looking up others in my Favorites in Ravelry and will get back to you…
I’ve made several baby blankets recently; both of these are a lot of garter stitch, but I love the squishyness of garter stitch for babies. This one, Colorful Wedges from Purl Soho, was for my brand new granddaughter with colors chosen by my daughter. https://www.ravelry.com/projects/Lesliedm3/colorful-wedges-baby-blanket. And this classic pattern, Moderne Baby Blanket from Mason Dixon Knitting, went to a dear friend. https://www.ravelry.com/projects/Lesliedm3/moderne-baby-blanket. Both of these are simple knits and the results are all about the color choice.
I have made Purl Soho’s Chevron Baby Blanket several times and it’s always a hit. https://www.ravelry.com/patterns/library/chevron-baby-blanket
Great size for strollers - can use bulkier yarn to make larger or enlarge pattern. Simple, quick and free pattern.
I was thinking of a chevron pattern but then I remembered that my daughter had crocheted a chevron blanket for the first baby!
You could get some fabulous colour effects by playing around with the 4 strands!
You always can—and good for when you don’t know what kind of baby will be arriving