You could lay the quilts ACROSS the top of the bed king size bed. This is what I have done. I bought a king size unquilted bedspread in ivory. (Walmart on line about $40.0 (also painted the walls ivory and have ivory curtains) The quilt tops I make about 70x90 so I lay them across the bed having a drop on 3 sides and quilt not coming up over the pillows. I try to have 8-10" drop which make the quilt big enough to cover us up. By having everthing ivory then I can change the color of the bedroom with different quilts whenever I want. Therefore using all the beautiful quilts I have made. Now our bedroom is lavender and last week it was pink. The bedspread hangs down similiar to dustruffle but you do not have to worry that matress is not covered by quilt. IMHO adding extra border to your already completed quilts is a lot of extra work when my idea is easy and fairly cheap!!!!!

So many different ideas. Have you noticed though that many of the new mattresses do have deeper pockets? My current mattress has a 15 inch pocket, add the mattress pad and it can bring you to 18.

Matelasse coverlet to floor than "quilt for the Day" (week, month, season) across the bottom. Occasionally it does get cool and I just pull up the quilt.

You can put a plain cream or white comforter on your bed, then layer your pretty quilts on top. They look especially pretty if you put them on the diagonal and fold down the point. You can also use them as sofa quilts if the colors work for you.

I had curtains that matched one of my borders on a special quilt - took them apart and made a 10" gathered ruffle that I sewed just under the binding to lenthen the quilt. It looked like a dust ruffle and I used it for several years like that. Thought it looked nice and like it belonged.

I do this too. I got my coverlet set at Bed Bath Beyond using the 20% off coupon that comes regularly. This also works beaufiully for decorative "bed runners" for various holidays and you can give a room a new look easily. I've made coordinating throw pillow covers for most of the quilts too.

I would probably do something like this, too. The 'topper' look is fine with me.

I extended a too small quilt for a friend.

I just made a strip of fabric (quilted)
to each side and the bottom & top..

It worked well.

have you considered adding a border?

I like the ideas of just using a plain cotton bedspread under it, but what I have done for my sister is to make a gently gathered strip of fabric (hemmed, about 14"in width, and probably about 3 times the length around the outer edge of 3 sides of the quilt) and with the biggest stitch you have, just attach it to the under edge of the quilt on 3 sides. It then looks like a second bed skirt, yet can be very easily removed to go back to the original quilt.