Lace is very collectible, especially if it's in good quality.
Table linens, especially the antique variety, if it's managed to make it this far, stain free, it's worth more than a nickle.
Try that for starters
Antique Linens on the Web
As much as I detest Ebay, they might be a good starting point for you --
I love Antiques Roadshow, and every so often - linens come up
The value wont put your kids thru college, but its more than some change.. depends on if you want to work to get rid of it...
You migth also try consignment shops -- or any local antique dealers