Would like suggestions on "freshening" church's fellowship hall.?

The room is approximately 30' x 80' with two large windows spaced along south wall and is used for dining, meetings and gatherings as well as daily use of childcare center for childrens' meals. We would welcome suggestions of color to make this feel warm and welcoming (the new window treatments are a celadon-green roman shade). Also need suggestions for floor covering materials and colors. Naturally, expense is a high priority.