Creating a Custom Page in Multisite Admin

Hello, I was wondering if anyone knows of a way to create a custom admin page that all my users on my Multisite could access. For example, I want the ability to create a Media Gallery page, insert a bunch of photos, text, etc. and then have that available in the left admin nav column. I am also using the Easy Blogging Plugin, so I would create a custom menu item for this. I hope this makes sense, thanks in advance for any help.