Thanks mskessa, It's not difficult thing to do but you have to be very careful. I draw a pattern on plain paper, cover a bigger cake-pan with this pattern, then wrapped it pattern with waxed paper and covered it with shortening. Then using 2-3mm of piping tip (I don't know the size because I cut the tip of the piping bag and used it without any tip), filled with royal icing draw along the pattern, once dried (a day or two) remove very carefully. And Done! Be careful not to draw in one go, Draw in three or four parts otherwise it would be very difficult to remove.
Be careful not to draw in one go, Draw in three or four parts otherwise it would be very difficult to remove.