Don't like Pink Gum? Wish it made a POP sound? Well then DERIVE IT! Make your own version, and even sell it the catalog for a small markup over my original, and you can keep the extra profits for yourself! You can express yourself AND earn credits at the same time. How's that for a sweet deal? You'll need a full account on IMVU, as well as a copy of Previewer. You can find out more about Deriving on the IMVU's Education Center. Below are the templates you'll need to get started:

This is the Texture map for the Bubble. Use this image to modify the color:

There is an Opacity layer for the Bubble but I'm not showing it here as it's "Solid Color Texture", which you can add by clicking on the 3 dots to the right of the texture in Materials. Basically, the darker the image becomes, the more transparent the Bubble becomes. You could add a custom texture if you want your bubble to display a logo or words, but keep in mind that half of the bubble is mirrored. Also, if you do use a custom texture, make sure that detail on this image matches the Texture map, or you're detail might be distorted.

This is the Wireframe layout for the Bubble. Use this if you wish to create a completely new look for the Bubble from scratch. This is best left for Advanced Users:

To add sound, I highly recommend you download and use Audacity. It's a free sound editing tool that can export out OGG sound files. OGG sound files compress down to less then 1/10th the file size of WAV files. SO USE OGG FILES!!! You can download it here:
http://audacity.sourceforge.net/