If you scroll about half way down this website, you will see a quilt put "on point" on top of a bedspread .... and it isn't even white:
https://ankastreasures.wordpress.com...10/07/refresh/
So can you do it? You bet! And you can do it anyway you like. It seems to especially work well for seasonal/holiday quilts that are too small in order to display them at a specific time of year (winter, Christmas, summer, etc.) and then replace them with another appropriate one.