This works for all tamagotchis, any shape. =)
If you want a new design, a completely new one, without wasting money---
Get a sheet of A4 paper. Design both sides with your dream design. Now, put your tamagotchi in one of the corners of the sheet, and start wrapping it. With a sharp pencil, draw around the screen. Do the same with the buttons and infrared. Open the paper and cut those shapes. Wrap it round the same way and voila!
If you have one of the translucent tamagotchis and want to change the colour---
Open up your tama. Be careful not to touch anything. Get some paint or nail varnish. Paint the parts that are open and visible. Wait for it to dry before putting it back together. Now you have a nice glittery tamagotchi!!
If you want a new design, a completely new one, without wasting money---
Get a sheet of A4 paper. Design both sides with your dream design. Now, put your tamagotchi in one of the corners of the sheet, and start wrapping it. With a sharp pencil, draw around the screen. Do the same with the buttons and infrared. Open the paper and cut those shapes. Wrap it round the same way and voila!
If you have one of the translucent tamagotchis and want to change the colour---
Open up your tama. Be careful not to touch anything. Get some paint or nail varnish. Paint the parts that are open and visible. Wait for it to dry before putting it back together. Now you have a nice glittery tamagotchi!!