Making squares into a blanket is a great way to do it :) And the squares themselves can be very satisfying just because they go from casting on to finished so quickly. It's nice to have something that works up fast, especially if you've got bigger things also on the go.
Here's a close-up of part of the underside:
And you can see a little more detail here (the flowers are the centre parts of big squares for the border that I'm working on adding):
How old is your sibling?