Have you tried the Mystery P.I series of games or the Big City Adventure series of games? All of these are straight hidden object games (with the exception of Big City Adventure: London Story). If you have already played these, let us know and I can offer more suggestions.
If you are looking for something more serious, have you tried Special Enquiry Detail: The Hand That Feeds and Special Enquiry Detail: Engaged to Kill? They are both crime-investigation games with pretty interesting storylines.