I just got a fun Christmas gift from Olaf Wit from Wit Industries: the Fendor-Bendor. A foldable rear fender (mudguard) for (fixed) gear bikes. This is Dutch produced rear fender for people who don't like a fender on their bike, but sometimes dearly need one. Like, when it's raining!
It's super easy to fold up and quickly fixed on your bike. So rain or no rain: now there's no excuse not to hop on your bike ;-)