There are some toys that have been around forever, and for good reason. Kids loved them then and kids love them now. I had Lincoln logs when I was a kid
Bop It Has been around for at least 20 years and we still play it sometimes at work, and kids still love it.
And who can forget Lite Brite? I wanted one so bad when I was a kid because I played it at my cousin's and I still remember the thrill of turning off the light in his room and seeing this thing come to life! WOW!