The theme is still Pinstripe; only 4 icons have changed. At this point, those of you who hate those icons have three choices: 1. Accept the new ones, 2. Fix the icons yourself by modifying the resources or whatever, or 3. Ask the author of Pinstripe to release the old version as a separate theme. But you stand little-to-no chance of getting the old icons back as default. Just check out this bugzilla entry and you'll get an idea why.