QB Issue Resolution:

We can’t customize the company color in QuickBooks Online. I suggest sending feedback straight to our developer team using this link: http://feedback.qbo.intuit.com. This lets us know what features or product improvements our customers want.

Resolution for Issue 'I have 2 linked accounts. I love switching between them, but they look the same. How can I customize colors, like in desktop?' available: Yes (Solved).
Source: Intuit Community forum.

I have 2 linked accounts. I love switching between them, but they look the same. How can I customize colors, like in desktop?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for company color
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Error Recovery for company color [Canada]
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