I have heels for the ceremony but found these very cute, inexpensive and *comfortable* ballerina slippers to wear at the reception. They have great reviews online and I got them quickly. Just wanted to share the link in case anyone else is in need of them also. I can't wait to wear them - even after the big day!
http://www.amazon.com/Isotoner-Embroidered-Pearl-Satin-Ballerina/dp/B001GK4SG0/ref=sr_1_10?ie=UTF8&s=shoes&qid=1263784810&sr=8-10