hmm, they are x-men the cartoon cards and not the movie right? Sounds like they may be worth a couple bucks each since its been so long and the movies have come out. If I were you though I'd wait a long time for them, you never know what they can turn into... just look at the original ninja turtles and star wars stuff.
That reminds me, I've got I think like thousands of basketball cards from the 80s and early 90s that have been packed away since I was a kid. I have alot of early jordan and some magic johnson and bird cards... and the original dream team pack unopened... hopefully they will be worth something when I sell someday.