My Amber Star hybrid lays speckledy eggs, and I know what you mean Cuwiar, about some days they are more speckled than others. Also as she went through her first laying season last summer, the speckles diminished until some days she was just laying plain pinky-brown eggs. I assumed she had gradually used up her supply of speckled pigment, the way hens' legs go from yellow to paler cream when they've had a long laying season. It's not lumps or little white flecks as Chris suggests, it's definitely a pigmented effect more like freckles. I don't know why they occur, or why some hens speckle their eggs and some breeds don't. The speckles are very attractive I think.