This plural usage is alien to me - what you describe as legos, we used to call "bits of lego" or "lego blocks". Lego is all-conquering, an example of a truly great idea that cannot be kept down. I have started to amass a new lego collection - at age 14 I foolishly believed I had grown out of it and donated my big box of lego to a school. Children and adults can benefit massively from building with lego.