Ground cover advice

My son just dug out all the sod from around my blueberries and I plan to surround each plant with rocks and replant with some sort of ground cover. I'd like to use something that will hold its own against grass and buttercups. The site is in partial sun, with the berries to the south and a couple fruit trees to the north. It's about 20' by 4'. Here's what I have available in no particular order:

Ajuga - does not seem to multiply aggressively for me, perhaps because it is the purply one. I don't have a lot of this but could cultivate it. Not sure how it fares with grass/weeds.

Goutweed - If I use this I will shear it to keep it on the short side (and not overwhelm the berries). I've used this around the base of the fruit trees, though, so would rather go with something else. Have lots.

Creeping Jenny - neutral about this but have lots of it.

Lamium - I have a couple varieties but find it to be weedy.

Vinca minor - nice that it's evergreen, but the buttercups are bullies in this. Have lots.

Arnica - tends to die down by end of summer, so probably not a candidate. Have lots.

Camomile - might work out. Have a small amount, could get more.

False Lily of Valley - native to my woods, so tons of it. Not sure if the site has enough shade.

Thymes - these tend to die off on me in harsh winters.

Sedums - I have a couple low growing ones, but when I've used them as ground covers the grass takes over.

Ornamental strawberries - I have a fair amount of these and they would be jolly.

Whatever I use will get tromped on to some degree when pruning and when harvesting the berries.

Any ideas? Thanks.

I have started using the clovers that have become so beautifully available. I like the additional fact that they fix nitrogen and make the soil there better. trifolium is a wonderful little bee attractor also. http://davesgarden.com/guides/pf/go/101691/

Bonehead - had you considered cover crops?
Blueberries are shallow-rooted, so don't put anything in the drip line that might compete for nutrients et al.

Phlox subulata? Lots of flowers!

I like the ornamental strawberry idea too, I read that there is a groundcover blueberry, wouldn't that be cool...

How about natives like Maianthemum dilatatum or Smilacina racemosa or cornus canadensis (though that's a bit difficult to get started) or one of the arums (for something different). Pixydish has a great plant called Parochetes communis that blooms blue . . .

Great suggestions! I'm leaning toward maianthemum (false lily of valley or snakeberry) since I have it all over the place and it gets full quite rapidly. Not sure how it transplants, I've never done that, it just seems to show up and then take over where it is happy. I have a large area planted with daffodils, bluebells and ferns, which it has recently colonized - makes for a nice transition - early bulb color covered by calm green native plants with a splash of white.

Omigosh, I never knew what that groundcover that grows wild here was called. Thanks. It can be intrusive, but is charming too.
Under Blueberries I would place a layer of compost then garden cloth, then moss or wood chips up to the dripline as has been suggested. Then put more garden cloth (to keep the grasses tamed a bit) and stepping stones for picking, and plant thyme and sedum in holes in the cloth. If you don't want to use the cloth, use several layers of newpaper dampened. It lasts for a couple of seasons and lets the groundcover establish.

That's so funny. I am trying to get it started. I just love the shape of the leaves. We don't have any around here. But I've bought some and I have a start from Willow, so we'll see if I can get it to be the pest that it is for you guys (along with the Coltsfoot I planted last year that is doing so well).

I have to say that oregano does really well for me in my part shade, as well. I have a couple of prostrate forms that are actually competing with the Smilacina.