Weddingbee boards

Hi all! I'm currently planning my June 2013 wedding. I love our venue because it's sort of rustic and you basically have to bring EVERYTHING in yourself to decorate. They do offer round tables and gray banquet chairs. I think we've decided against chair covers and have chosen our wedding colors to be grays, purples with some hints of black.

I am stuck as to what color tablecloths we should that will look nice with the gray chairs. Should we go gray tablecloths w/ a purple runner? Or white tablecloths with a gray runner & purple accents?

Any help would be appreciated! I've posted a couple pictures of the venue (being cleaned before someone else's wedding). 

And this is the venue with someone who has chosen to use chair covers... Maybe we should go with covers?? If we did, I would rather go with BLACK chair covers simply because we are having BBQ food & I'm worried about bbq sauce getting on white.

Any help is appreciated! :)

@secondchances: I'm thinking of using these birch bark buckets filled with carnations (all dif shades of purples). My centerpieces won't be really tall.. but hopefully very full. I am considering gray pintuck tablecloths (because they are beautiful!!!!) but worried they may be too fancy.

@secondchances: Thank you!