Prepare your pudding according to package instructions, add a few squirts of blue food gel and mix well. Set in fridge to firm up.
Use a food processor to crush your vanilla wafers. Use the pulse option of you have it to have a variation in consistency of your "sand".
Fill the bottom of your cups with a thin layer of ground vanilla wafers for a layer of "sand".
Top vanilla wafer crumbs with your blue "ocean pudding".
Sprinkle more vanilla wafer sand on one half of the pudding.
Place a gummy shark on top!