There are some freeware SVG cards here: http://david.bellot.free.fr/svg-cards/
It's a bit of a challenge to get them onto a PC that's not running Linux. You have to download 7-Zip and do 2 extractions to get to them.
However, they have some nice card backs. Here's what I currently have:
(Click to enlarge)
There are several other images, including the Olympic rings, a Linux penguin, a T-Rex, a footprint, some French stuff, and some regular deck backs.
There are a couple of different versions that you can download. The latest is a .SVG deck in a table format. Another one has individual cards. The cards all look very French, and I'm thinking that they may not show up as well as most of the mods that Fozzy and others have created.