Fabric choices

Does anyone want to help me pick fabrics? I'm looking for a coordinating set of prints for my 4yr old boy and 7yr old girl. Flannel or plain cotton. They don't have to be matchy-matchy, just look good together. I'm planning a pair of "Christmas Jammies" but don't want to use an overly holiday looking print. I'd love to hear suggestions from those of you that keep up with designer fabrics!