@Zolglunen,
We currently don't have accessories for our switches sold separately. We have seen a large amount of support to add this to our product lines from the community, and after passing this feedback on to our teams, we created the 'Colored Switch and Dimmer Survey' based on what they would like to know about how users would use colored plates. I would assume that as we see more stemming from this survey, we may see more information about multi-gang wall plates.
Our switches are, however, designed to fit most standard wall plates. As one warning, some wallplates will inset the switch or dimmer a tiny bit and not sit flush with the switch. There are a few threads across the forum discussing this, and some users have linked the wallplates that they have had success with.