For this project, you'll need a lenticular sheet. I got one free with a photo and just peeled the original picture from the back and used WD40 to remove any left over stickiness.

The trickiest part is getting your image just right. Measure the spacing on the lenticular sheet and then use Lenticular Software ( I used Lentikit at http://lentikit.sourceforge.net) to create an image to match. Play around with the number of frames and the size of your image until you find something that works perfectly!

Cover the image with double sided sticky back plastic.

Carefully line the lenticular sheet up with the image and stick on top.

Neatly cut around the outline with a pair of scissors, being carefully not to cut any of the moving pixels off.

Use a cutting knife to cut out the trickier bits.

Keep going until you're left with just the frames of Nyan Cat and nothing else.

Punch a hole through the top of Nyan Cat with a small hole punch.

Punch an eyelet through the hole, to give it a neat finish.

To make the rainbow, we're going to use lots of plastic strings. These used to be know as scoubidous and really popular a few years ago.

Clip the strings together in order of the rainbow. I used two strings to get the right height on my rainbow.

Place some waxed paper over top and iron.

The strings will fuse together nicely.

Cut a piece of clear plastic to match the size of your rainbow.

Glue the rainbow on to the plastic.

Now for the fun part. Record the Nyan Cat theme tune on to a greeting card sound recorder. I found mine on eBay and it was really cheap.

Glue the rainbow and sound recorder to the back of Nyan Cat with a hot glue gun.

Glue the speaker and the play button on top. You can just cut off the extra cables.

Attach a jump ring and clip on to a necklace chain and you're all done!

Here's a video of the necklace in action.

And here's what Lauren thought of it!