You can replace the default badge on your OAuth App by uploading your own logo image and customizing the background.
By default, a new OAuth App will have an automatically generated identicon. 默认肖像徽章如下所示：
After you create an OAuth App, you can customize the app's badge by uploading a logo and selecting a background color. 徽章是圆形徽章内的方形徽标图像。 You can choose a background color for the badge, which can be used to visually distinguish your app.
徽标应为 1 MB 以下的 PNG、JPG 或 GIF 文件。 为获得最佳渲染效果，建议图像大小至少为 200px x 200px。
要创建自定义徽章：
- 在任何页面的右上角，单击您的个人资料照片，然后单击 Settings（设置）。
- 在左侧边栏中，单击 Developer settings。
- In the left sidebar, click OAuth Apps.
- Select the OAuth 应用程序 you want to modify.
- In "Application logo", drag-and-drop an image from a local folder or click Upload new logo to select an image from your computer.
- 裁剪图片。 When you're done, click Set new application logo.
- 在“Badge background color（徽章背景颜色）”中，输入徽章背景颜色的十六进制颜色代码。
1. Click Update application. 