You don't need too much talent or experience to make a shower curtain, window valance or custom towels!
Go to the fabric store and get your desired fabric--they always have Disney prints at JoAnne Fabrics.
To make the shower/tub curtain, you just need to hem a plain piece of material (you may need to sew a few panels together, depending on the width of the fabric )and sew a "tube" along the top to insert the rod or add tabs along the top to hang from.
To make the valance for your window, you can make a cornice by covering a plywood "box" that fits the top of the window. Just use a staple gun to afffix the fabric. Or you can make a balloon valance by sewing a "tube" for the rod and leaving the bottom empty to stuff with tissue paper.
To make custom towels, get your favorite Disney fabric and cut strips that match the width of your solid colored bath and hand towels. Add the Disney fabric along the "accent edge". Make sure to hem all raw edges. Attatch with stitch witchery or sew on.
Have fun creating!!