So that I don't have to create them from scratch, does anyone know of a source of ready-made images which could be used in drafting floorplans in excel draw?

I refer to iconic drafting images meant to represent doorways, windows, electrical outlets, light fixtures, etc.

I would like to acces such a collection as autoshapes (I think. I am very new with Excel's drawing features)

(I know that many other drafting programs exist and are superior for this application. I currently have no choice in this matter, though if you can vouch from significant personal experience for a freeware drafting program I would be grateful for your input.)

Thank you very much.