Ours was done with the pattern called the cuddle wrap by Great Copy Patterns out of polar fleece. It was honestly cutting out 3 pieces and less than an hour on the serger :) and the fun part is you can also alter it and add holes to feed car seat straps through so a kiddo can be bundled up there as well as snuggly safe.
In addition like I said we did some burp cloths and we like to make them almost an hourglass figure so your shoulder front and shoulder back have a bit more surface area for when a burp becomes a waterfall and the flannel seems to keep it from just running down the material. Then the curve fits on your shoulder without bunching. We usually make several simple ones with the word burp or whatever on it, but last night we had the help of my boyfriend in the sewing room and he wanted to make one too (talk about a first)
Our simple ones
And behold the cuter one up by the boyfriend who's never been in a sewing room before....
With these done it's onward and upward to we continue our less than 50 day trek to Christmas.... oh the joy.... Slaves to the machines....