Natively, Trello does not support changing the the color of lists. You may be able to find 3rd-party browser extension that can do this for you.
When you say " add an icon to a card", what do you mean exactly? If you mean attaching an image to the card, you can do that via the "Attachment" button that's on the card back.
If you mean a sticker, you can drag a sticker from the board sticker menu onto a card front.
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. In this video, I'll share my favorite Trello templates. Templates mentioned in ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events