1. Purple wintercreeper is only minimally "purple" in winter but can develop a number of problems and not a highly recommended plant for your area. And the quickness of its spread is kinda relative - even in my zone I do not consider it very fast.

2. Leadwort is not evergreen, the blue is rather intense and yes, it IS of doubtful hardiness for you.

3. Vinca needs at least part shade. But should be hardy.

I'd consider ajuga, cotoneaster or juniper. All are tough, durable plants hardy enough for your zone. Different ajuga varieties are available with colored foliage and most will have attractive blue flowers. Cotoneaster comes in both deciduous and evergreen forms, spreads rapidly and produces berries. Some cultivars do develop fall/winter color. Junipers don't do much other than cover the ground but they are excellent for sunny slopes and extremly low maintenance and drought tolerant once established. Just make sure you select true groundcover forms, like Juniperus horizontalis, as many others will grow far too tall and leggy. They do come in a range of foliar colors as well, from mint green to blue to golden yellow.

I grow vinca minor in full sun-no shade whatsoever all day facing south-zone 6 CT and it has done remarkably well. It is thriving. I didn't plant it (the previous homeowner did) but I'm glad she did bc I never would have thought to put it where it is bc of all the warnings saying no to full sun. Right now it has lots of little blue flowers but not smothered in them like my phlox. For the rest of the summer it will have sporadic flowering. I love it!
I give it a 'trim' late winter and it gets more lush/full every year. Good luck!

Are any of the grouncover sedum (stonecrop) hardy for you? Many varieties grow quickly, some are evergreen, they're all drought tolerant and most prefer full sun. There are quite a few varieties, so you could mix & match for variation.

Here is a link that might be useful: groundcover sedum images