What can I do with old lace,hand made and store bought.?

Use it with concrete to make pretty potting containers.

You can use it to spray paint just about anything.

You can starch them and use them as holiday decorations (If they are small enough).

You can starch them and hang them in your windows.

You can place them over a lamp shade to cast a pretty shadow on everything.

You can decoupage them onto a thin piece of wood and frame them.

Do you need more examples?

Have a wonderful day.

You could use those as trim for everything from mirrors to clothes, or on your table, fireplace mantel (if you have a fireplace), You could use them as valances for your windows.

Have you thought about selling them? (If you make them yourself)

I'm always looking for lacy doilies for projects.

Here are some nice ideas:

https://www.pinterest.com/janetnance/lace-trim-edgings-ideas/