I transferred last year to UC Davis, and have just had a great experience mainly due to my faculty mentor. I will finish a small-scale research project at the end of this quarter and he has just helped me an incredible amount by guiding me, helping me network, recommending resources, etc. He basically was kind enough to take me as a complete novice and show me the ropes, and I want to give him a gift to express my gratitude.
I thought about writing a card, but I'd really like to do a little more. I actually am pretty decent in art, and I thought about either making a portrait of him (pretty much free since I have the supplies, and they don't take me very long to do), but I thought that could seem rather weird. I want to give something that honestly shows my thanks, but doesn't seem too uppity or out there.