For your stylish sister/cousin:
These shoes look fun and comfortable, with the support across the front of the foot and the non-stiletto heel. These could be great work or going out shoes.
For your brother/cousin/boyfriend:
The contrast piping on the collar and pockets makes this fun and not too grandpa-ish. Though grandpa might enjoy it too.
For the over 21:
Leather and cotton surround the stainless steel on the outside, and maybe you could add a bottle of something to go on the inside as well, to complete the gift.
For your aunts and uncles:
These would also be good for recent grads or people trying to set up a home. Simple and clean and easy to blend with any decor. You can add monogrammed initials for $6.
For Mom or Dad:
Everyone loves a cozy blanket, and these neutral colors go with any couch.
For the pet owner:
You should definitely add the $6 embroidery monogramming on this one. So cute!