I sew them together to make comforter covers. But donating them would be a very nice thing to do.

You could always make extra pillowcases considering the amount of money they charge for extra pillowcases to begin with, use the top sheet as a bottom sheet and tuck all the way around, or stop buying sheet sets, buy separate bottom sheets and pillow cases only...and really solve the problem. In summer hot weather, a top sheet is so much cooler and keeps your blankets and quilts cleaner longer in any weather...you aren't always washing blankets.

I make the bed and sleep with the top sheet...tried without and don't like it one bit. Guess it's all in how you were raised and what you prefer.

Can they be made into fitted sheets?

I read a woman's account of going to college, and the college's idea of linen service. Each week, each student got one clean, flat sheet and pillow case. The old sheet was put on the bottom and tucked in, the new clean sheet on top of that, then the blanket, quilt or afgan, etc.

Like Stitchntime9, I don't like to sleep without a top sheet, but between my DH and me, they always come undone and one of us will end up with a blanket/comforter, and the other with the sheet. Since we don't like tucking the end of the sheet under, I just started making comforter covers out of two flat sheets,everything stays together and we're sleeping under a "top sheet".

I just bought 4 top sheets to make curtains for my sons apartment. Sheets are a whole lot cheaper than curtains.
Also have used them to make table coverings and curtains in a bedroom.
Kathy G in MI

You can also make fitted sheets from them.Say your mattress is 5" thick,cut a 5" square out of each corner,at each corner bring the cut edges together and sew a new seam.Waalaaaaaa,new fitted sheets.Also like others have said curtains,pillowcases,quilt backs ,duvet covers,even tablecloths.You're limited only by your imagination!!
Kathi

I make nightgowns for myself,like the long ones because
I never know who is coming in to the house.

Also, I make pj.s bottoms for my adult son(still at home)
Why buy a set(size 4x) when he never wears the top?

I have made everything from curtains, slipcovers to clothes from flat sheets.

I would make fitted sheets from them. I do different than Kathi though. I use at least a 4" tuck under allowance PLUS the thickness of my mattress. If my bed is 60X80, my mattress 6" thick, I'd add 20 inches each way (or 10 each side) My square to cut from the corner would be 10". I sew the cut edges together & add elastic to the ends, starting about 8-10 inches up each side from the corner seam I made. I make a lot of flannel for my son-in-law (& daughter but it's more his request). Flannel shrinks so much that it works better to make them because I can wash the fabric before making to shrink it. They use a flat sheet but it will outlast 2 bottoms so when I make them a set & make 2 bottoms. That way their top sheet & pillowcases are worn out at the same time as their 2 bottom sheets.

If you made another bottom sheet, you would get longer life from the pillowcases that came with the set.

Here's a link to instructions for making a fitted sheet.

Also, I especially like the pillowcase pattern (called a "housewife pillowcase") on this website. (Click the "pillowcase" link in the left menu.) Gives you pillowcases that fit the pillow, have an interior pocket to hold the pillow in, don't slide off the pillow, and look almost like a decorator pillow on the bed.

I've made lots of these from flat sheets I get at discount stores like Ross.

CMC

Here is a link that might be useful: Fitted sheet pattern and pillow case pattern

The suggestions you all had were interesting. I might try the fitted sheets. I'm a first time sewer so I might need some help. Thank you all for your great ideas.