I, too, had a go at making my own invitations and order of service programmes using supplies from a 'DIY' invitation company here in the UK. I used a silhouette graphic of Mickey and Minnie (which has been used by a few other disbrides as well), and designed a logo for our Swan VR. I also added a small rhinestone for a bit of 'bling'!! I used the logo on everything from all the 'pre-VR' stationary, right through to all the 'bits' used on the day itself!!
I was surprised how easy it was to create the invites, and how well they turned out. Here are a couple of photos. The second one was taken by Randy on the day itself - I made sure I took an invitation with me so as it could be professionally photographed!!!
Why not have a go at designing them and printing them out on normal paper? That way you can always go to 'Plan B' and order professional ones later if yoiu are not happy with the results. I think you may be pleasantly surprised!!