This has got to be the most unsual color scheme ever because it is so hard to find people who have used these two colors for their wedding. It's even hard to find pictures with red and purple together. I'm still looking!!!! It's cool. I guess I will be the first to post pictures.
http://farm3.static.flickr.com/2161/2070357370_8ed88dcc3f.jpg
http://bp2.blogger.com/_mVNQFjdp3b0/SBFG_q7Ft6I/AAAAAAAAAPk/i1kHvc3La-0/s1600-h/4-25+Post+-+Red+and+Purple+Wedding+FINAL.jpg (I REALLY LIKE THIS ONE!)
Purple and Red Bouqet -http://a248.e.akamai.net/f/80/71/6h/www.ftd.com/pics/products/W16-3456_c.jpg
Thats just a few. Just google 'red and purple inspiration board' or 'red and purple wedding' and you'll get lots of ideas and color schemes! I agree its not commonly used but it looks gorgoues! I was/ still am considering it. Good luck!