If you miss the old 16.1 Jarvis look, then it is easy to bring it back and still have all the nice new features of 17 Krypton.
It only requires a few steps to change the skin from the default 17 Estuary to 16 Jarvis Confluence.
Keep in mind there are other Skins that can also be used and are easy to switch around in for the best look and feel.
Steps How To Make 17 Krypton Look Like Old 16 Jarvis Skin
Step 1) Click System icon from the top left
Step 2) Click Interface Settings
Step 3) Click Skin
Step 4) Click Get More
Step 5) Click Confluence skin By Jazz_X
Step 6) It will download and install
Step 7) Click Yes
The old Confluence Skin will now be enabled giving the old look and feel. To switch back simply change the skin to Estuary.