Personally, I recently started an improvised scrappy blanket using mini skeins and other scraps I've collected over time. It's a super relaxing knit that's all about playing with colour and simple texture.
Below is a list I've compiled of some of my favourite mini skein or scrappy projects specifically using sock weight yarn:
Dathan pullover by Kate Davies Designs
Luminaria Shawl by Lindsey Fowler
ADVENTurous Wrap by Ambah O'Brien
So Faded by Andrea Mowry
Brioche Adventure by Jonatan Tollow
Habitation Throw by Helen Stewart
Pixel Rise by Kemper Wray
Radvent Cardigan by Ambah O'Brien
Dust of Snow by Helen Stewart
Outline by Beata Jezek
Stripey Turtle Tank by Emily Curtis