I know that in my home it drove me nuts also. In my daughter's room, we replaced them with mirrored doors. Still sliding, but she loved to have them to check her outfits, so she mostly closed them. In my son's room, we just took them off completely and he put his bookcase and video chest in there. His clothes showed, but with no door to 'stuff' things behind, it actually stayed neater. As far as replacing them for regular doors, the main problem (besides cost) would be the frame. They are easier enough to make if you are handy, but most closet doors are heavy and require a different space than hinged doors. I'm sure it is possible though.