Since the fabrics are so nice and almost look like art, it would be cute to cover canvas with them and glue letters over the top to spell a name or monogram like this:
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Don't want to do letters? I am envisioning a set of 3 square pictures, each a solid color pulled from the fabric, with a white giraffe silhouette in the center. This would also be an easy DIY project. Just use a photocopy machine to enlarge the giraffe design and cut out one giraffe. Trace onto the center of the canvas and paint the background a solid color using simple craft paint from Hobby Lobby. It will probably take 2-3 coats of paint but the end result will be fun and graphic!
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Or how about this adorable wall decal, available in a variety of colors, with an almost matching giraffe:
If you are not crafty yourself, I suggest recruiting a crafty family member or friend to help you with some projects. Tell them their assistance can be their gift to you instead of a shower gift. Or turn to etsy.com. You can truly find ANYTHING you could possibly want to decorate a nursery there.
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Since Mom is a teacher, I am guess books are important to her (not that they aren't always important!). Forward facing bookshelves placed near the nursery chair create a perfect story-time nook and add color and interest. Try organizing books by color for extra impact.
Finally, a few giraffe touches wouldn't hurt to play up the cute factor. I like this small rug on clearance at JCPenney for in front of the crib, plus its on clearance for $29.99!
Hope that helps you get started on your modern, slightly safari room!