Here's what I started with.
And after a lot of thought and fooling around, I ended up with this.
I put the gold and black panel on a woodgrain paper and added foam hearts in black and gold and then flags of all 4 of the house colors. The daughter was happy with it.
I also made this card below so she could have a choice...she took back it with her to give a co-worker having a baby. So I guess they passed muster :)
The background is Distress Oxides and water. I ran a page of it through the printer and found a free digi of Hogwarts. I added text and book paper and mounted it all on a piece of aqua cardstock. It's a 5x7 card so I could get all these papers on here. Of course, I added Diamond Stickles for the stars.
If you're a Harry Potter fan, you can go here to Scrapbook.com for some similar products.