I'm not sure whether that's already implemented or easy to modify, but I think it could be somewhat trivial...
I'd like to specify a label for the progress bars, and it'd show *inside* the bar, so I could have several bars nicely stacked, or with minimal spacing.
[wppb progress=75 option=animated-candystripe percent=inside label='inprogress1']
Which, in my concept, would display more or less like so (with the coloring behind it, of course):
[ 75% inprogress 1 ]
[ inprogress 1 75% ]
Any help is appreciated!