I think you're going to sell the most tickets with your choice of queen size. I think that using a broad color scheme and a traditional pattern will sell more tickets, too, unless your church is in the arts district of a major metropolitan area. Traditional colors and patterns remind people of "the good old days" and the quilt that was on grandma's bed. :)
Around the World, Log Cabin, Wild Goose Chase in a dark/light configuration instead of only two colors - so many would be great choices for a raffle. Best of luck and I hope this turns out to be the best you've ever made. :)