You can privately share an ideabook with your client:
open your ideabook and click on the "sharing" button at the top.
In the sharing dialog, click on the "private" option and then click the "update" button.
Next, you can enter the email address or Houzz user name of the client in the dialog and click "add" to notify them that you've shared an ideabook with them.
You can also define their permissions: only view the ideabook or contribute to it as well.

More info here: https://www.houzz.com/discussions/help-how-do-i-forward-email-my-idea-b-dsvw-vd~78468

Hi there,

Actually, there is a specific sharing function that will allow your client permission to see just the ideabooks you would like to share.

To use it, go to your ideabook, click "Sharing", then enter the email address of the person you would like to share it with. They will have access to it from their own account, so there will be no need to share your own login.

Hope that helps!