Where can I find patterns or ideas for crocheted tablecloths or runners (not fillet!)?

What about your local library or the op shop. You could join ravelry.com (takes a couple of days) and check their patterns out or place a request for help. Some of the published magazines are also good for this sort of thing. Or try http://www.craftown.com/crochet.htm there might be something that you like as there are tablecloths that are not filet or there is a butterfly bedspread that could be adapted.