I decided a few weeks ago that my next project would have a step-through frame as there will come a time when I will need one. I am now casually musing over what to look for as a conversion.
Ideally it will have 26" wheels, but not a suspension fork, which rules out a lot of MTB frames. I'm not keen on rack batteries (cente of gravity) so to fit a downtube battery it will have to have a single downtube or the step-over benefit will be lost. Ideally it will have disc brakes as well, though not crucial. Other considerations are capacity for wide tyres and preferably vertical rear dropouts for a rear hub motor. I'm visually thinking of something like the Woosh Santana or Wisper 705. In fact, if I wasn't such a cheapskate and didn't like tinkering with bikes so much I'd happily settle for either (despite the rack batteries).
When it comes to colour and "image" I'm not fussed about the frame shape but don't really want "Barbie Pink"
. However, I rebuilt a bike for my wife a few years ago and had it powder coated in dark blue which looked rather good.
Generally ladies bikes are hardly used and dumped in the garage/shed. There are plenty for sale in good condition but unfortunately most are at the lower end of the quality scale. There are some bargains around though.