I don't understand how anyone can prefer the old gralats. They look like someone opened paint and scribbled inarticulately onto the canvas and mumbled, "Art", through spoonfuls of glue.
That aside, Even if the old ones were better, there's no point in keeping them. If you haven't noticed, recently ("Recently" = ~1-2 years ago) there has been a gradual change in non-item graphics around iClassic - a wild uniform graphical style appears! I'm glad classic is continuing this "Out with the old, in the the new" trend. Recently iClassic has been becoming more and more uniform and it's really increased the quality of graphics over that 1-2 year period.
That aside as well, I seriously doubt it's going to be changed back and I'm sure you'll get used to it the same way you got used to the new tileset when that came out. Change can be hard - but you'll get used to it!