I was gifted a huge pile of yarn from someone’s stash, so I used some of it to make a blanket!
There was a lot of yarn, so I picked out some red/yellow/orange/green/blue to make a rainbow blanket with. Everything was from their stash except the purple stripe in the border (they didn’t really have any purple, so it’s from my stash).
I didn’t want to have to weave in a bunch of ends, so I chose a pattern where I wouldn’t have to! The colors switch after every 2 rows, so the other color gets carried up the side. 
Pattern: Chic Modern Mosaic Blocks Throw
Hook: I (5.5 mm)
Yarn: worsted acrylic (mostly…)
The blanket ended up about 52” x 71” - small throw size but a bit longer.
The back:
I definitely should have tested some of the mystery yarn before I used it. Everything looked/felt fine while I made the blanket (and the stash was 99% acrylic), but after washing I realized one of the yarns probably had some wool or something in it. 
At least it didn’t really shrink, just felted a bit (lighter green on the right side):
Close up:
It definitely could have been worse! Now I know to check the other mystery yarns. 
Some WIP pictures:
