This is a page of seals from an issue of Animage from October 1993.
These are some NHK promotional seals from 1998.
These are some seals that seem to be related to the Super Famicon game, from 1996.
And these are some seals that seem to be a promotion from the 1996 movie.
The seals pictured below I bought from Yahoo Japan auctions. They were included with Nintama Rantarou Ice snacks. The front images are shown below. The backs of each seal have a character sketch and information about that character. My favorite it definitely seal number 19, with Rikichi, Doi-sensei, and the kids in drag! I'm sorry the scans are so small, but I wanted this page to load quickly. If you are really interested and want a larger scan of a specific seal, send me an email.