A couple Micro Geckos would work.
Things are small though so you would need a good lid but I had a friend that had 4 or 5 of them living in a 1 gallon Ice Cream container. They were even laying eggs but he never tried to hatch them.
Proud Owner of:
1.0 Chinese Water Dragon (Timon), 1.0 cat (Maxwell), 1.1 Leos, 0.0.1 Pacman Frogs. Always expanding.