Currently we are duplicating token's chain.
In the (1), we have just a small logo, then (2) has no blue rectangles at all, (3) & (4) are something we can consider in the future. For most of the tokens, we won't have visual representations. But, the same way not all of your contacts on Telegram have profile pictures, we can use the same paradigm. We can use colors + up to 4 characters to display a token. One benefit is that once you remember a token's color, it's easier to find in a long list. I will file an issue, and we can consider this in the future.