Prepare your pan. Use a 6 inch springform pan if you have one , or use a mousse ring . Line the bottom and sides with parchment (optional but easier!) . If you don't have a springform pan or mousse ring , line the bottom of a regular pan with plastic wrap so that it comes up the sides of the pan (so you can pull it out once set).
Powder the biscuits any way you want. Use a food processor , blender , mortar , rolling pin or your hands!
Add the melted butter and icing sugar and mix until it comes together like wet mud !
Press into the bottom of your prepared pan. Refrigerate until you make the filling.
Sprinkle gelatin over the cold water. Let stand for 5 minutes . Then heat in microwave or stovetop to melt it. Let cool while you make the filling.
Whip the cream to soft peaks. Keep refrigerated until needed.
Beat together the cream cheese , granulated sugar and vanilla until smooth.
Fold the whipped cream into the cream cheese filling.
Fold in the gelatine liquid.
Divide filling equally into as many bowls as you are using colours. Add a drop of gel colour to each. I used pink, yellow and blue , and kept one plain. Mix colour well in each bowl. Add more until you get the desired colours.
Spread filling of one colour over the biscuit base as smoothly as possible. Freeze for 10-15 minutes or until set.
Spread the other colours in the same way , freezing in between.
After spreading the final portion of coloured filling , chill for atleast 4 hours or overnight .Un mould the cheesecake or lift out of pan , remove the parchment . Smoothen the top using a spatula . Keep chilled until its serving time !