I had fun dressing up some old photo mats. You can take those boring white or cream colored photo mats and simply spice them up with fabric to match your decor. If you don't have fabric I am sure decorative scrapbook paper would work too.
If you don't have a photo mat I will show you how to make your own from supplies you probably have in your cupboard.
For step by step instructions on how to make these custom mats hop on over here.