I just made a quick module based on the K2 Quickicons admin module to add the quickicons from the K2store component to the Joomla dashboard.
After just building a site for a client with K2store, I thought the only reason they would want to go to the back-end of the site regularly (It is an online rental site and the products don't change) would be to check on the orders if they ever lost any of the emails.
For that reason, I just adapted the K2 admin module to show the K2store icons and repackaged it.
You can download the module here
