Okay, design scrapped and bag ordered! I'm usually indecisive, too, but time pressure forced me to pick one and finalize the design.
I used Amber Shaw's Lucky Stars bundle. I'm not sure how much will get cut off around the edges (or be needed to wrap around the computer), so I kept the edges unembellished.
I wanted a sleeve with a handle and a small compartment for the charger, so I ended up ordering from
this listing.
This one appears to be the same bag; it's more expensive but has a much faster turnaround time.