i made this one for one of my brother's friend and he is of 11 yr. so i decided not to use rechargeable one.
it is cheap to make and look really cool;)

Step 1: Materials

cardboard
LEDs x(1 big, 3 medium, 3 small)
transparent sheet
blue colour acrylic sheet (or acrylic blue colour if you don't have blue sheet)
black tape
switch
battery 9v
common craft tools

Step 2: Front

use the image and print it to copy on a black cardboard and cut it.

Step 3: Light Medium

cut circles similar to front from transparent sheet and blue one as well. place one by one.

Step 4: LEDs

place led in center or like image 1 and connect in parallel.
place switch and battery clip
place all together and cover with black tape

its complete.
hope you enjoy.