Mega Instant Hat
This is worked up in a jiffy with a super bulky yarn.
You can also work with 3-4 strands of worsted weight yarn held together. Try mixing various textures as well, to get fun effects. This is a quick enough knit that you can experiment and see your results instantaneously!
Have fun with this one, its great for gifting!
Also try adding a pom pom to the top!