This thread brings back so many memories. I'm glad to see the '90s inserts getting some love. Some of my Griffeys:
Not that this is rare but I loved the look of these cards:
And some better ones:
Probably my 2 best:
1999 Topps Tek gold 10/10
and 1999 Thunder Super Rave 14/25. My buddy actually pulled this one when it came out and just gave it to me a few years ago.