I also make a "Happy Birthday" card using several squares with rounded corners to make the "background". Again, I set myself the challenge to only use scraps of paper and card to make these cards. It's soooo rewarding when you succeed and you see how much use you can actually get out of scraps (that is IF you use them in the first place, and not just keep saving them! LOL!) I decided to use a black pen and "dot" the bookplate to make it a bit more different and hopefully give it a more "designed" look.
By the way: Blogger seem to have had an ongoing problem for a week or so with showing photos (I know it's not only my blog that's affected). If a photo doesn't get displayed, RIGHT-click on it and choose "Show Picture" and it should appear. Hope that helps :)