I would like to start off with I have no connection to the following items except being a customer of the person who makes them. I will say that they are made very well and are very cute and comfy to wear. I have had mine a few weeks now and love mine.
Theses are toy story ones
ADULT BABY TOY STORY PULL-UP TRAINER PANT 30-40" W - eBay (item 150360358897 end time Jul-23-09 06:42:11 PDT)
These are Thomas the train ones
ADULT BABY Thomas The Tank PULL-UP TRAINER PANT 30-46 - eBay (item 150360091644 end time Jul-22-09 07:42:51 PDT)
These are Winnie the Pooh ones
ADULT BABY WINNIE POOH PULL-UP TRAINER PANT 30-40" W - eBay (item 150359497380 end time Jul-21-09 12:40:49 PDT)
Check them out like I said I think this is the closest to adult underoos/funpals we can get at the moment. for those who can fit into the kids ones still and she will custom to fit you or certain characters if you ask nicely also.