Also some lace can leave the right imprint on your cake. If you have some lace you can harvest for this project like Kakeladi recommends--check the closet and dresser--curtain? tablecloth? old wedding dress? belt from vintage dress? Test first on a pan or on the table top. Place clean lace on crusted icing. Take some different color icing and spread it over the top--remove lace--hopefully the design remains. Also test it by waiting 5 mins before removing.
Or lay the lace down and spray some spray can food color --start and stop off the cake-- just breeze the stream of color over over the cake. Don't stay stationary with the spray. Don't point at the cake to start or stop. Different laces provide different effects--just gotta see whacha got & what combination will work.
If you are fondanting the cake test and see if you get a lace design by pressing the lace into the fondant with a rolling pin. then carefully apply to cake so you dnt' rub out the design or just use thin pieces of the impressed fondant in a patchwork design--or cut them in scallop shapes and apply to the cake like swags. Between the patchwork pieces pipe small netting designs--just snatches of small crossword puzzle type designs that looks like the netting that lace is applied too.
Say none of this comes out well defined enough no problem--use it anyway and overpipe it.
I don't know how well you pipe--you could get the netting look with a pointed skewer and just draw it on fondant--hey a meat tenderizer has that kind of effect too. Use it freshly rolled fondant--after it sets up it won't take the design.
There's brush embroidery too google it if you're a piper.
You'll get there.
(hope there's not too many typos)