Here are the ten I thought of:

• decorations for your house/apartment
• a musical instrument
• lessons for the musical instrument
• nice speakers (right now I just have computer speakers and they suck)
• camping equipment
• instruction books for crafts you want to learn (I'm thinking stuff like knitting, sewing etc.)
• materials for those crafts
• gas money / money for motels, so you can take a random road trip to a place you've never been before
• gym membership
• yoga classes (or martial arts or whatever)

Also I totally second whoever said "nice kitchen knives". I got one as a Christmas present once, and it's probably the best holiday gift I've ever received.