My feeling when it comes to creating birthday cards for sweet little Princesses is that you should pile on as much prettiness as possible. Think glitter, bling, sparkle and plenty of layers. Forget clean and simple... girls want glam right?!
I figure my 3 year old recipient isn't going to be too fussed by general design principles so forget trying to include white space. I'm not very good at that anyway. I also don't think she's going to care about acceptable colour combos, or what 'old' product lines I'm mixing (mainly Maggie Holmes though in case you're wondering).
I'm sure she's not too concerned that my finishing touches and middle layers are compiled of different 'scraps' I found on my desk leftover from other projects. Or that I ran out of foam dots and had to add my dimension with bits of chipboard.
And if she's not worried about those things... then I'm not either.