If you want to display a logo on on an eight-or-more-box card you can just print your logo onto address labels and stick them on the cards. You can have colour at no extra charge. A lasar printer is a good idea for a waterproof result.
I went one better, I made a Word doc clone of the entire brevet card innards complete with logo and painstakingly copied over the info from the control boxes, I can now print cards onto blanks as required as far in advance of the event as I like.
(this was a direct result of havving one year's cards go awol and get the replacement set the night before the event) However Pam now sends them out a week before so have not a problem since but it's nice to have asource of spare cards if needed. I generally reuse last year's DNS's by sticking new details inside; if these don't get used either they get recycled into the blue bin; don't want to do AUK out of any more funds