I like the size for a lap quilt.

If you can't find the same fabric, check out some of the marbles or other blender fabrics. If you can, bring the quilt top to the shop with you and "test drive" a few to see what looks best with it. I like borders on my quilts, regardless of the size, so I tend to add a couple, one narrow, one wider. It's like adding matting/framing to a picture. It finishes it off nicely.

Thanks for the suggestions. I agree that the width is fine, but my niece is 5ft8inches, and I would like it to cover from her feet to her neck, so I am going to go buy some good quality fabric at the quilting store. It is black, so I think black, because the yellow would be really hard to match/coordinate with.

Thank you so much!
Nancy

Take to the store. I would go with very little to no print in a color to go with what you have. I think darker color would frame your quilt beautifully.