Your young nieces and nephews: you love the guts out of them, but you're glad they're not yours. No matter what, you're going to spoil them to pieces, especially on Christmas. These gifts will ensure you will secure favorite aunt status for the umpteenth year running.
I'll get things started with a few of my own ideas; if you've got any you'd like to add, just follow this format in the comments:
Name and price of the product (please link this to a product page when applicable, so people can easily buy it.)
Image or video of the product.
A note explaining why you think it's great.