In addition to charms dangling from cell phones, embossed stickers on cell phones are becoming popular. Some of the stickers are good for personalizing your laptop or other gear. They come in a lot of uniquely Japanese styles, which make them great for souvenirs or omiyage. What's neat is about these stickers is that they're composed of multiple sections that are held in position until you apply them. You can find these embossed stickers in electronics stores such as BIC Camera. If you weren't looking for them, you'd probably never see them, so look for them hanging on a wall near the cell phones.
We got some for our laptops. Check out the rabbits viewing the moon on the Mac and the maneki neko with bells and coins on the HP netbook.