You might check ebay or another site for a Fiesta tablecloth. There have been a few made of cloth that have the Dancing Lady, the disc pitchers, plates, and a few other motifs. If you could start with one of those it might give you some inspiration. Other than that, anything that gives a deco look should work. You could do a layered or repeating design, or use a tulip design somehow. You could also try the Fiesta collectors website:
http://mediumgreen.proboards.com/index.cgi . My wife and I are also Fiesta "collectors," but there are some hard-core collectors on this site and they have a for sale section where you might find a tablecloth or some other ideas.
Darren