I think by the ones with the big feet you mean the Hydnophytums or Myrmecodias. There are also some bromeliads (Neoregelias, Tillandsias and Cryptanthus), some Lecanopteris, some Elaphoglossums, Dioscorea, peperomias and other oddballs.
I've been contemplating getting one of those but at $200 I don't think that's going to happen. If you know of a cheaper source please let me know.
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As for having ants I actually do have some ant colonies but the symbiotic relationship in the wild is usually very specific about which ants live in which plants.
I put a plant with one of my colonies and it was nothing more than an obstacle for them.