Now don't tell me you don't have any scrap yarn about your person.
We all have those little bits squirreled away somewhere don't we. Over on the Everyday Knitter Facebook group we have set ourselves a challenge this month to learn the Russian Join technique and make a "magic ball" from all our scraps. I'm using sock weight yarn but some others are using DK.
If you've never used the Russian Join method before I'd highly recommend that you give it a go. All you need is a nice sharp tapestry needle and it's a way of giving you a smooth join between 2 ends of yarn without any additional bulk.
Once you've made your magic ball you can then knit (or crochet) until the cows come home, making a wonderful multi-coloured project without any worry about sewing in the dreaded ends.
I used this tutorial here which explains it all very clearly. If you find yourself with a spare 5 minutes this weekend why not give it a go. Be warned though, it's highly addictive.
Have a great weekend