Your ThemeColor field is obviously an integer type and so it is rejecting a bool value input. If you use a parameterised query, then it should succed. Something like this :
_bd = new DataBases();
_bd.Command.CommandText = "INSERT INTO `Theme` (`ThemeColor`) VALUES (@themecolor)";
_bd.Command.Parameters.AddWithValue("themecolor", Office@010Blue.Checked);
//etc