There seems to be plenty of freeware for web graphics - but I haven't found any quality vector graphics on the web. In addition to about 60 disks of vector graphics - I subscribe to a couple of art services. Even though you are doing non-profit work - you might consider paying $15 or so to subscribe to CLIPART.COM for a week. You can download as many images as you want during that week. They have some decent images - not anything earth shattering - but you might find most of what you need there.
I am in desperate need (by tomorrow) of some FREE vector graphic clip art for
Mah Jongg tiles
Anyone have any ideas?