These Boomer lights from Knog are silicone bodied and available in a host of colours. We’ve been using a pair all through the winter and they’ve been reliable for commuting and have held up to the weather really well. They’ve presented no problems even though we’ve washed the bike numerous times with them still attached.
The battery life is great too considering how bright the Boomers are – we’ve used the them on their own for towpath riding when heading back from the trail after dark. The only niggle we’ve found is that the on/off button is pretty sensitive, so if you stick them in your pack, they may accidently switch on.