All exercises you do at your own risk. And always start VERY gently (so as to reduce risk of slipping a disc).

Cat dips.
http://www.everydayhealth.com/back-pain-pictures/best-yoga-poses-to-soothe-back-pain.aspx#06

Tricep stretch, good for upper back pain (just below shoulder blades). I put left (the first side) elbow against door frame and lean into it.
http://img.webmd.com/dtmcms/live/webmd/consumer_assets/site_images/articles/health_tools/oa_pain_management_slideshow/getty_rf_photo_of_four_women_stretching.jpg

Always do this last - Child pose.
http://www.everydayhealth.com/back-pain-pictures/best-yoga-poses-to-soothe-back-pain.aspx#03