Hi Johanna,
My name is Umar and I'd be happy to help you out with your question.
Please note: This is a user-to-user community forum. We are users just like you who help others. We are not employees of Microsoft.
You're right! The New Teams app experience in Teams for Education offers a slightly different approach for team pictures. While the classic Teams app provides a variety of pre-made team avatars, the New Teams focuses on uploading custom images.
Unfortunately, Microsoft currently doesn't offer the classic set of colorful team avatars directly within the new Teams app. However, there are workarounds as mentioned earlier where you can utilize the classic avatars in the new Teams:
Downloading them from Classic Teams and uploading in the new Teams.
Another option is to leverage the Teams web client. Navigate to https://www.microsoft.com/en-us/microsoft-teams/log-in and sign in to your account. Access the desired team and click on the three dots (...) next to the team name. Select "Manage team" and then go to the "Settings" tab. Here, you'll see the option to "Choose from existing avatars" alongside the "Upload picture" button. This allows you to pick from the pre-set images available in Classic Teams. (if available).
For specific instructions on the items listed above, kindly check the link below.
https://support.microsoft.com/office/39ac9fa6-654a-4128-b647-f4bfc19e65c5
I hope this information is helpful. Please let me know if you have any other questions.
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Best Regards,
Umar Majeed