We started with pinboards, pins and index cards. In order to visualize who was doing what we printed out a photo of every team member and pinned the photo to the current index card that was in the "Work in progress" (Wip) column.
A while ago we changed this system: We bought a large whiteboard and started using magnets instead of pins. This gave us the chance to print magnets for each team member thus you simply have to put a magnet on the Wip index card to visualize that you're working on it:
As you can see, we didn't use actual photos but gave every team member the opportunity to choose a picture of their liking. I chose Dr. Zoidberg. If you choose to do so aswell, don't forget to include a legend on your whiteboard so that everyone can see which magnet belongs to whom.
Every team member has 10 magnets, which makes it really easy to still know who completed what since the last standup, as we keep the magnets on the index card until the next standup.
You can order the magnets here.