Here are some:
I love these ideas, particularly displaying in embroidery hoops https://www.sadieseasongoods.com/repurposed-vintage-doily-project-ideas/
A white doilly sewn to a red pillow for Chistmas. If the doillies are made of cotton you can dye them different colors, or you can paint them with fabric paint. Several doillies stitched together to make a table runner. Under the glass on end tables
Sew them together, in a pleasing pattern, to make runners for your dining or kitchen table or dresser top.
Sew them together for a crazy quilt style lace curtain. Particularly wonderful with rustic decor.