doing a search I see it is a 'brand' dolly with diapers costing $19.00 a pack on amazon
Might make some washable diapers and throw in some ecology lessons!
All the colors in the accessories are brights, polka dots fabric pops into my mind.
Or you could do a 2 color quilt that goes with the car carrier?
https://www.kohls.com/product/prd-57...E&gclsrc=aw.ds
I want to see the finished project, dolly quilts are fun because they can be finished in a day