It's relatively easy to replace the bands on your Pebble. To get the job done you will need a spring bar tool, a replacement watch band that measures 22mm, and, of course, a Pebble smartwatch.
Gently slide the tool in between the watch and the strap. Move the tool toward the center of the watch after you make contact with the spring to dislodge it from the socket.
Carefully remove the spring bar from your old band and insert it into your new ones.
It's more difficult to get the new bands into place than it is to remove them.
The easiest method is to place one side in the socket and then use the tool to snap the other side into place.
And just like that, your Pebble has transformed into a completely different device.