I’m not sure exactly whether the cute LEGO brick mouse is comfortable completely in your hand, but if you are the LEGO fanatics, you should be interested with the useful LEGO brick.
The red LEGO brick mouse features two buttons and a scroll wheel, and sizes at 9.5 x 3.2 x 5.5 cm. and connects computer with USB port. It’s priced at around $32 USD and available at Curiosite.